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The rear strut bump stop 551513E000 is the cushion that rides on the rear damper of the first generation Kia Sorento, the body-on-frame SUV Kia built on the JC platform from 2002. Kia catalogues the part as BUMP STOPPER-RR in the rear shock absorber and spring section, and it is one of the most frequently requested suspension buffers for this vehicle in the replacement market. This guide covers what the part does, which Sorento versions it fits, how the size reads, and what wholesale buyers should confirm before they commit to an order.
The Sorento JC runs a live rear axle located by coil springs, with a separate telescopic damper at each corner. That layout gives the vehicle its towing ability and its payload, but it also leaves a limited distance between the axle and the frame at full compression. The buffer is the component that manages the final part of that travel.
Through ordinary driving the buffer does nothing at all: the suspension works inside its spring travel and the damper controls the body. When the rear is loaded with passengers, luggage or a trailer and the wheels meet a sharp compression event, the spring runs out of travel and the axle heads for the frame. The 551513E000 compresses progressively at that point, adding a rising spring rate that converts the last few millimetres of travel into a controlled deceleration rather than a metal-to-metal impact.
A damper driven repeatedly to full compression works outside its calibrated range, and its seals and valving take the strain. The buffer is the sacrificial part in that path: it costs a fraction of a damper and it also spares the coil spring, the upper mount and the axle housing from shock loads. Because it only acts at the extreme of travel, a worn buffer rarely announces itself on smooth roads. It usually shows up as a thump from the rear over potholes, speed bumps and driveway ramps, or as a cracked and crumbling block found during a suspension inspection.
This is a rear axle component, one per side, and it is not handed: the same number serves both the left and the right damper. The Kia catalogue places it under the rear shock absorber and spring diagram, and European aftermarket catalogues list it across the Sorento I production run, from the 2002 launch to the end of supply, with several listings extending coverage to 2011 for late-built and export vehicles.
| Kia Sorento I (JC) version | Engine code | Catalogue years | Position |
|---|---|---|---|
| 2.4 petrol, 4WD | G4JS | 2002-2009 | Rear, 1 per side |
| 2.5 CRDi diesel, RWD and 4WD | D4CB | 2002-2011 | Rear, 1 per side |
| 3.3 V6 petrol, 4WD (facelift) | G6DB | 2006-2011 | Rear, 1 per side |
| 3.5 V6 petrol, 4WD | G6CU | 2002-2011 | Rear, 1 per side |
| 3.5 V6 petrol, RWD | G6AU | 2002-2006 | Rear, 1 per side |
Catalogue fitment spans the 2.4 four-cylinder petrol (G4JS), the 2.5 CRDi common-rail diesel in its two power stages (D4CB), the 3.3 V6 fitted to facelift vehicles (G6DB) and the 3.5 V6 in both rear-wheel-drive and four-wheel-drive forms (G6AU, G6CU). Both drivetrains appear for the diesel as well, so the buffer is not tied to a single chassis configuration. Body styles across the range are the five-seat and seven-seat station wagon bodies of the first generation Sorento.
These figures are large for a strut buffer, and that is exactly why they are worth checking: they separate this part from the smaller buffers fitted elsewhere on the vehicle and from similar-looking numbers for other SUVs.
The 31 mm figure is the bore of the central opening that slides down over the rear damper assembly. The 88 mm figure is the outside diameter of the buffer body. The 110 mm figure is the free length along the bore. Independent aftermarket data corroborates the package: a Febest KD-SORR pack measures about 12.0 x 8.8 x 8.8 cm and weighs 0.272 kg, Febi Bilstein 29775 lists an inner diameter of 32 mm and a thickness of 111 mm, and Magnum Technology A80314 lists 31.5 mm and 111 mm. All three sit comfortably around the Bonpora drawing once manufacturing tolerance and packaging are allowed for.
Free length sets how much compression travel remains before the buffer goes solid. Fit a shorter block and the axle reaches its stop earlier, which cuts suspension travel and pushes the damper to work higher in its stroke, where it wears faster. Fit a longer one and the buffer is already partly compressed at ride height, which firms the rear end and can make an empty vehicle feel harsh over small inputs. When the old part has lost its moulded number, the 31 x 88 x 110 mm figures are the fastest way to confirm a match.
Three confusions surround this reference, and each of them produces wrong orders for distributors and workshops.
The front struts of the Sorento JC carry their own stop bumper in the 54602 number series, a smaller component with different dimensions. Some online listings describe 551513E000 as a front part, but the Kia catalogue places this number in the rear shock absorber and spring section, and the aftermarket catalogues that publish engine-level data list it for the rear axle. Confirm which axle the workshop is servicing before a quotation is issued.
Kia issued this reference in more than one revision, and cross-reference catalogues group 55150-3E000, 55151-3E000 and 55151-3E001 in a single replacement family. The figures Bonpora publishes match that family. Where a buyer needs strict conformity to the number on the removed part, the moulded marking or a dimension check against 31 x 88 x 110 mm settles the question in minutes.
Buyers who arrive without an OE number often quote a brand reference instead. Equivalents published for this position include Febest KD-SORR, Febi Bilstein 29775, Ridex 1182R0036, Monroe PK441, Maxgear 72-3389, Optimal F8-8442 and GSP 537187. These references are useful for identifying an enquiry, but they do not replace the dimensional check, because catalogue groupings occasionally collect more than one revision under a single listing.
Bonpora moulds this buffer in polyurethane, formulated for suspension buffering rather than general rubber work. The material resists the oil, ozone and temperature exposure found around a rear damper, holds its shape across the full load range of the Sorento and does not take a permanent set under repeated compression. Each piece is supplied with a one-year warranty and ships in neutral export packaging on a 15-30 day delivery schedule, so distributors can plan stock around their own selling season.
Wholesale quantities are quoted against order volume, and OEM support is available for distributors who need their own branding, labels or packaging. Custom design work is offered where a buyer wants a different free length, bore or outer profile: send the sample or the drawing and we will confirm tooling, minimum order quantity and lead time before production starts. The auto parts wholesale catalogue lists the rest of the suspension buffer range alongside the other product lines.
Quote the OE number 551513E000, or the 55150-3E000 and 55151-3E001 variants if that is what the old part carries, together with the model year and the engine code where known. Add the quantity needed and the destination port. If the number on the removed buffer has worn away, send the bore, outside diameter and free length in millimetres and we will match the enquiry against the drawing.
Yes. The two forms are the same Kia reference written with and without the hyphen, and cross-reference catalogues group both with 55150-3E000 and 55151-3E001 in one replacement family. For strict conformity, check the moulded number on the removed buffer or verify the 31 x 88 x 110 mm dimensions before ordering.
No. This is a rear axle component. The front struts use a stop bumper in the 54602 number series with its own dimensions, and the two are not interchangeable. A small number of marketplace listings describe this reference as a front part; the Kia catalogue and the engine-level aftermarket data place it at the rear.
One buffer per rear damper, so two per vehicle. Most workshops renew the pair at the same time, because a buffer that has failed on one side means the other has seen the same mileage and load history.
Yes. The polyurethane buffer line covers a wide range of Korean, European, Japanese and American references, and custom moulding is available for sizes that are not in the standard range. Send the OE number or the dimensions and we will confirm availability and terms.
Send the OE number, the model year and the quantity per vehicle to our export desk and we will return a quotation with unit prices, packing details and the next available shipment date. Buyers who are still comparing suppliers can start from the China auto parts factory overview, which sets out sampling, OEM and wholesale terms in one place. Quote the number, not the description: 551513E000 identifies one specific 110 mm rear buffer for the Sorento JC, and it is the fastest route to the right part.
