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The OE 31336764085 is the front spring bumper that BMW dealer catalogs file as Additional Shock Absorber, Front and parts platforms list as rubber buffer, suspension. It slides over the piston rod of the front spring strut and cushions the last of the compression travel before the damper bottoms out. Bonpora molds this profile as part number 4110224 in micro-cellular polyurethane, with a 23.3 mm bore, a 66.8 mm outer diameter and a 85.9 mm free height. One car needs two pieces, one per front strut, and the same reference serves both sides. The part is produced in China, covered by a 1 year warranty, packed in neutral export packaging and shipped within 15 to 30 days, with OEM and custom design support for project buyers.
What makes this number worth a full page is the family logic behind it. Inside the same 6764 group, the last digit carries the fitment: 31336764085 serves the E60 5 Series and E61 touring on standard suspension, 31336764086 takes the sports suspension cars of the same bodies, and 31336764084 moves to the E63 and E64 6 Series. Later E60 catalogs also carry 31337905316 for the same front position, and the rear axle runs its own numbers under the 3353 prefix. The sections below sort out the chassis coverage, the suspension split, the aftermarket crosses and the dimension band.
The bumper is the last line of defense inside the strut assembly. Under normal load the coil spring carries the weight and the buffer never engages. When the wheel drops into a deep pothole or the car runs fully loaded, the spring compresses toward coil bind and the polyurethane bumper takes over as the final cushion, protecting the damper seal, the piston rod and the top mount from metal to metal contact. Its micro-cellular structure compresses progressively and rebounds without permanent set. The buffer also cuts noise and harshness over sharp inputs, because a soft progressive stop passes far less force into the body than a hard metal contact would. Because the piece sits exposed to debris, moisture and heat, the foam hardens and crumbles with age, and a collapsed buffer is a common source of front end clunks on E60 cars with higher mileage. BMW requires a new bumper whenever a shock absorber is replaced, which keeps the profile in steady rotation alongside every strut job.
Dealer data places 31336764085 on the front axle, left and right, one piece per side, with a required quantity of two per car. BMW lists the part inside group 31 33, the supplementary spring and buffer section of the front suspension. The rear axle of the same cars takes a different piece from the 3353 group, so a front or rear mix-up is the first thing to rule out when a quoted size looks wrong. Buyers comparing related shock absorber parts will meet the same axle logic across the BMW range.
One profile, one set of figures. The table below is the basis for every cross check that follows.
| Item | Data |
|---|---|
| Product name | Strut Bump Stop, front spring bumper |
| OE reference | 31336764085 |
| Bonpora number | 4110224 |
| Fitment | BMW, front axle left and right |
| Size | 23.3 x 66.8 x 85.9 mm |
| Material | Polyurethane, micro-cellular |
| Country of origin | China |
| Warranty | 1 year |
| Delivery time | 15 to 30 days |
| Packaging | Neutral export packaging |
| Custom service | OEM and custom design support |
Dealer and trade catalogs tie 31336764085 to the fifth generation 5 Series and its platform relatives, with US dealers showing applications from 2004 onward and European lists covering production through 2010. Engine coverage is wide, from the M54 and N52 six cylinders through the N54 and N55 turbo sixes to the N62 V8, and the diesel range from 520d to 535d sits on the same standard suspension hardware.
| Model | Catalog window | Notes |
|---|---|---|
| 5 Series E60 sedan | 2003 to 2010 | 523i, 525i, 528i, 530i, 535i, 545i, 550i, petrol and diesel, rear wheel drive |
| 5 Series E61 touring | 2004 to 2010 | same axle parts as the sedan, LCI included |
| X1 E84 | 2009 to 2015 | trade lists cover sDrive variants, US dealer data shows the sDrive28i N20 |
The filter that matters more than the model list is the suspension option. A US BMW specialist files 31336764085 for vehicles without sports suspension, and the E60 chassis documentation describes the optional sports suspension as 15 mm lower with harder springs, a different damper tune and stiffer bars. Suspension specialists repeat the warning that bump stops are specific to suspension options, and one US parts house asks buyers to send a VIN before ordering because its pages do not carry the full fitment picture. Petrol and diesel cars of the same bodies share the standard hardware, so the option question does not depend on the engine under the hood. The safe habit for quotations is to take the VIN or the suspension option first and only then send the price.
BMW built the front bumper of these platforms as a family of near identical profiles, and the suffix carries the difference. Reading the group number together with the suspension option and the platform keeps quotations inside the right variant.
| Reference | Role | Catalog note |
|---|---|---|
| 31336764085 | Front, standard suspension | this article; E60, E61, also listed for X1 E84 |
| 31336764086 | Front, sports suspension | sibling number filed for vehicles with sports suspension |
| 31336764084 | Front, 6 Series | E63 coupe and E64 convertible, 645Ci and 650i |
| 31332283182 | Front, M cars | E60 M5, E63 M6, E64 M6 |
| 33536762722 | Rear buffer | E60 rear axle |
| 31337905316 | Front, later number | E60 and E61 including LCI in current dealer catalogs |
One prefix separates the two axles: 3133 for the front strut bumpers, 3353 for the rear shock buffers. The M cars add a second split, because the M5 and M6 carry their own front and rear references instead of the standard profiles. The wider chassis and suspension parts range follows the same group number logic, so the axle question comes before the variant question on every inquiry.
The European aftermarket covers this reference through a long and flat cross table, and most carriers file the piece as a bare bumper rather than inside a dust cover kit, which keeps quotations simple. The lines below are the references trade buyers meet most often.
| Brand and number | Catalog data |
|---|---|
| febi 26177 / SWAG 20 92 6177 | rubber buffer, suspension, front axle, the most quoted cross |
| Original Imperium 35442 | height 85 mm, weight 70 g, front axle, listed directly for 31336764085 |
| Optimal F8-7334 | cross listed in the same reference group |
| Meyle 314 642 0004 | cross listed in the same reference group |
| Topran 501 957 | cross listed in the same reference group |
| Maxgear 72-3383 / Stellox 11-98125-SX | budget lines in the same reference group |
| Gates SUS1326 | suspension buffer cross in the same reference group |
Catalogs frame the same piece with slightly different figures. The aftermarket data reads 85 mm free height at 70 g, the Bonpora profile measures 85.9 mm with a 23.3 mm bore and a 66.8 mm outer diameter, and the sibling numbers 64084 and 64086 sit inside the same size band. The outer diameter is the stable anchor, while height and bore vary by a few tenths because the foam block is conical and each source reads it at its own points. Treat the 66.8 mm outer diameter as the hard filter and confirm the free height against a sample before shipping an order.
Searches like BMW front bump stop 66.8 mm, E60 jounce bumper 85 mm and strut buffer 23 mm bore land on this profile. The outer diameter is the quickest filter, because the sports suspension sibling of the same cars differs in height and neighboring BMW platforms cluster at other diameters.
Buyers who hold a number search 31336764085 bump stop, 31 33 6 764 085 equivalent or febi 26177 buffer. US dealers list the reference under four spellings, 31336764085, 31-33-6-764-085, 31 33 6 764 085 and 31.33.6.764.085, and the later number 31337905316 returns its own catalog pages, so listings should carry every variant.
Typical combinations are E60 front bump stop, BMW 530i jounce bumper, E61 spring buffer and X1 strut bumper. Model searches work, yet the suspension split above explains why a VIN check belongs in every reply before the price follows.
Project buyers with a sample or a drawing search custom PU bump stop manufacturer and OEM jounce bumper supplier. The same molding line that produces 4110224 serves molded polyurethane bump stops variations in height, bore and hardness, and the OEM and custom parts service page explains the drawing to sample process.
Bonpora produces the 31336764085 profile in-house as number 4110224 and ships it from China in neutral export packaging under a 1 year warranty, with a standard dispatch window of 15 to 30 days. Molded polyurethane lets the same tool set serve height, bore and hardness variations for fleet and project inquiries, and OEM and custom design support covers customers who arrive with a drawing or a worn sample instead of a number. Wholesale buyers can order the profile packed under their own brand. Every batch is checked for height, outer diameter and bore before packing, which keeps the dimension band from the tables above stable across orders. For prices on 31336764085 equivalents, send the OE number or the target dimensions and the quotation follows within one working day.
A front set is two pieces, one left and one right, and the same reference fits both sides. The rear axle takes a different buffer from the 3353 group with its own references, so two front pieces never cover a full car.
No. The family splits by suspension option, and catalogs file 31336764086 for the E60 and E61 cars on sports suspension. The M5 and M6 carry their own front reference 31332283182. Confirm the suspension option or the VIN before quoting.
It serves the same front position on the E60 and E61, including LCI cars, and current dealer catalogs list it alongside the earlier number. Trade buyers quote both references, because warehouses stock the profile under either number, and quoting both on the same inquiry sheet avoids lost orders.
The E63 coupe and E64 convertible use the sibling number 31336764084 for the same job, not 31336764085. The two profiles are close cousins from the same group, so confirm the chassis code before shipping.
