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The front strut bump stop 05171137AB is the compression buffer that crowns the front damper of a large group of compact Chrysler, Dodge and Jeep vehicles. Because those cars share the JS, PM and MK platforms, one buffer number serves the Chrysler 200 and Sebring, the Dodge Avenger and Caliber, the Jeep Compass and Patriot, and even the Lancia Flavia sold in Europe. Bonpora supplies the same component in polyurethane as number 4110151 for wholesale buyers. This guide explains what the part does, which vehicles it fits, how the reference numbers relate, and what a factory-direct order looks like.
On these platforms each front corner carries a MacPherson strut. The bump stop is the elastomer block mounted on the strut rod so that it meets the top mount when the suspension reaches full compression.
Under normal driving the block does nothing: the coil spring carries the load and the damper controls the body. When the front wheels hit a pothole, a speed bump or a heavily loaded kerb, the spring runs out of travel and the strut heads for its upper limit. The 05171137AB compresses progressively at that point, converting the last part of the stroke into a controlled deceleration instead of a metal-to-metal knock. It also protects the damper, because a strut repeatedly driven to full compression works outside its calibrated range and wears its seals faster.
A worn buffer rarely announces itself on smooth roads. The usual symptoms are a hollow thud from the front over sharp compressions, a harsher ride with the vehicle loaded, and a cracked, crumbling or crushed block found during strut or spring work. Because the part is inexpensive next to the strut itself, most workshops renew it whenever the front struts come apart for service.
The Chrysler Group compacts of this era were built on shared architectures, and the suspension hardware followed. Catalogues that publish axle-level data list this reference for the models below, always for the front axle, left or right side, two pieces per vehicle.
| Brand and model | Platform | Catalogue years | Position |
|---|---|---|---|
| Chrysler 200 | JS | 2011-2014 | Front, 1 per side |
| Chrysler Sebring / Cirrus | JS | 2007-2010 | Front, 1 per side |
| Dodge Avenger | JS | 2007-2014 | Front, 1 per side |
| Dodge Caliber | PM | 2007-2012 | Front, 1 per side |
| Jeep Compass / Patriot | MK | 2007-2017 | Front, 1 per side |
| Lancia Flavia | JS | 2012-2014 | Front, 1 per side |
The table shows the widest published coverage, and individual catalogues trim it differently: some list the Avenger only to 2010, others to the 2014 end of production, and European listings start the Caliber and Compass at 2006. Production calendars and market revisions explain the spread. When the order must be exact, confirm the OE number moulded on the removed part or the vehicle identification number before committing to stock.
Cross-reference lists add two export cases. The Lancia Flavia is the European version of the Chrysler 200 saloon, sold from 2012, and it appears under the Fiat group service number K05171137AB. February-built CKD records for the Chrysler Sebring in China also surface in aftermarket data, which matters for buyers supplying the Chinese and export service markets.
Four number groups point at this one component, and each has a reason to exist.
The earliest catalogues carry the part as 5105543, revised through 5105543AA, AB, AC and AD. The design later moved to the 5171137 series, with 5171137AA followed by the current 5171137AB, written with or without the leading zero. The genuine Mopar listing records that 5171137AB replaces 5105543AC, and Crown interchanges both families on a single product card. For buyers this means one quotation can cover enquiries that quote any number in the chain.
After Fiat took over the group, service documentation for the Lancia Flavia referenced the part under the K-prefixed number. Some cross-reference catalogues therefore show K05171137AB under the Fiat/Lancia heading while the same card lists 5171137AB under Chrysler. They describe the same front buffer.
The rear suspension of the same vehicles uses a different jounce bumper, the 5272705 series with AA, AB and AC revisions, a different shape and its own dimensions. The two families are not interchangeable, and quotations must state the axle. Genuine documentation also names this reference several ways, including Stop/Bumper - Jounce, Suspension Strut Bumper and Coil Spring Damper, so the fastest check when a part arrives unmarked is the drawing: bore 20 mm, outside diameter 62 mm, free length 76 mm.
The drawing below summarises the part as supplied from the factory.
| Item | Value |
|---|---|
| Bonpora number | 4110151 |
| OE reference | 05171137AB (5171137AB family, replaces 5105543 series) |
| Position | Front axle, left or right, 2 per vehicle |
| Bore | 20 mm nominal |
| Outside diameter | 62 mm nominal |
| Free length | 76 mm nominal |
| Material | Polyurethane |
| Warranty | 1 year |
| Delivery | 15-30 days |
| Packaging | Neutral export packaging |
| Custom service | OEM and custom design support |
Aftermarket packaging data corroborates the drawing. The Febest CRD-AVF equivalent ships in a 7.9 x 6.2 x 6.2 cm carton, which leaves just under the published 76 mm free length for a 62 mm body, and the Crown version lists a unit weight around 0.1 kg with a 165 x 89 x 127 mm box. Independent data agrees with the Bonpora figures once manufacturing tolerance and packaging are allowed for.
Bonpora moulds this buffer in polyurethane rather than filled rubber. The material choice matters to wholesalers because it changes how the part behaves in the catalogue and on the vehicle.
| Property | Polyurethane (Bonpora) | Conventional rubber |
|---|---|---|
| Compression set | Low, recovers shape after repeated hits | Higher, takes a set over time |
| Ozone and heat ageing | Strong resistance | Cracks sooner in hot climates |
| Oil and fluid contact | Good resistance | Swells and softens |
| Load consistency | Uniform batch to batch | Varies with compound |
| Unit cost | Moderate | Lower |
Front buffers live near the engine bay, where heat, ozone and occasional fluid contact age ordinary rubber quickly. Polyurethane holds its rate and shape across that environment, which shortens warranty exposure for distributors. The full polyurethane bump stop range covers the same approach across other platforms.
A correctly sized buffer only works at the end of the stroke, so a polyurethane replacement does not change normal ride comfort. What decides the fit is the geometry: bore, outside diameter and free length must match the removed part.
The source demand behind this article is simple: buyers want the original part or a faithful replacement, sourced directly from a manufacturer rather than through layers of trade.
A replacement part matches the OE reference in fit, dimensions and function without carrying the vehicle brand. Bonpora supplies replacement buffers engineered against the published OE data, and every enquiry is checked against the reference number and the drawing before dispatch. Buyers who require strict conformity to a moulded number can request samples first and measure against 20 x 62 x 76 mm.
For distributors with their own brands, the factory offers OEM labelling, branded boxes and private moulding. Custom design covers changes of compound hardness, free length or outer profile: send the sample or the drawing and the tooling, minimum order and lead time are confirmed before production. Details of the programme are on the custom parts page.
Standard supply ships in neutral export packaging on a 15-30 day schedule with a one-year warranty, and pricing is quoted against order volume so that distributors can plan their season.
Send the OE number, the model year, the quantity per vehicle and the destination port to the export desk. If the number on the removed buffer has worn away, quote the bore, outside diameter and free length and the factory will match the drawing. Buyers building a wider suspension programme can browse the chassis and suspension catalogue alongside this line, where buffers, mounts and related hardware are grouped for one-stop purchasing.
Yes. The leading zero changes nothing; both spellings describe the same front jounce bumper, and the family also includes 5171137AA together with the earlier 5105543 series it replaced. For strict conformity, measure the removed part or request a sample.
No. The rear jounce bumper on the JS, PM and MK platforms is the 5272705 series, a different component with its own shape. Some genuine listings name this reference under both front and rear captions, so confirm the axle before ordering and check the 20 x 62 x 76 mm drawing when in doubt.
Two, one for each front corner, and the part is not handed. Workshops normally renew the pair at the same time, because both buffers have seen the same mileage and load history.
Yes. The polyurethane line covers a wide range of American, European, Japanese and Korean references, and custom moulding is available for sizes outside the standard range. Send the OE number or the dimensions and we will confirm availability and terms.
Bonpora manufactures and exports suspension buffers from China for wholesale buyers worldwide. Quote 05171137AB or 4110151 with your quantity and destination, and the export desk will return unit pricing, packing details and the next available shipment. For the material background behind the range, the polyurethane bump stops overview is a good starting point.
