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The OE 2043230044, recorded in Mercedes-Benz catalogues as A 204 323 00 44 and shipped today under the index 204 323 00 44 64, is the front suspension bump stop of the C-Class W204 generation. It is a compact polyurethane element seated on the front damper rod inside the coil spring, one piece per side and two per car. Independent catalogues extend the reference to the S204 estate, the C204 coupe, the E-Class W212 saloon and the C207 and A207 coupe and cabriolet. This page presents Bonpora No. 4110139, a polyurethane replacement manufactured in China for wholesale export, nominal size Φ18.6 x Φ62 x 91.4 mm.
The front axle of the W204 uses a MacPherson strut layout: the coil spring and the damper share one assembly, and the bump stop sits at the center of that assembly. When the strut approaches the end of its compression travel, over a deep pothole or a fully loaded descent, the stop is progressively crushed and absorbs the last part of the movement. It prevents a harsh metal to metal impact between the piston rod, the top mount and the body structure, and it protects the damper seal from overload.
Because the stop takes part in every full compression event, it is a wear part rather than a lifetime component. Polyurethane and rubber both harden with age, take a permanent set or crumble into fragments. A flattened stop shortens the effective front travel; typical symptoms are a hollow knock from the front over sharp bumps, a ride that turns harsh with passengers and luggage on board, and accelerated wear on the dampers and top mounts. The stop is inspected whenever a front damper or spring is removed, and renewed in pairs.
Catalogue data from Sasic, Febi Bilstein and other suppliers covers about 63 Mercedes-Benz passenger vehicles. The table below summarises the main applications; the number on the removed original or the VIN remains the final check.
| Model | Chassis Codes | Production Years | Engine and Drive Notes |
|---|---|---|---|
| C-Class Saloon | W204 | 2007 - 2014 | C 180 to C 350, Kompressor, CGI and CDI engines, rear wheel drive and 4MATIC versions per catalogue |
| C-Class Estate | S204 | 2007 - 2014 | same front strut layout as the saloon |
| C-Class Coupe | C204 | from 2011 | C 180, C 250 and C 350 CGI |
| E-Class Saloon | W212 | 2009 - 2016 | front axle listings in European catalogues |
| E-Class Coupe / Cabriolet | C207 / A207 | 2010 - 2017 | genuine Mercedes application for the front axle |
The catalogues agree on one boundary: the part is specified for vehicles with standard suspension. Febi notes list it for vehicles without sports suspension and without electronic drive dynamics regulation, and dealer data for the C250 and C350 states the same exclusions. AMG and sport package builds use different stops, so a performance trim order needs its own number. The second boundary is the axle: 2043230044 belongs to the front axle, and the rear axle of the same cars takes separate references. Regional catalogues also disagree on 4MATIC coverage for some engines, which is why the removed part or the VIN should settle the order.
| Parameter | Value |
|---|---|
| Product Name | Strut Bump Stop |
| Country of Origin | China |
| Bonpora Nos | 4110139 |
| OE | 2043230044 |
| Fitment | Mercedes-Benz |
| Size | Φ18.6xΦ62x91.4 |
| Material | Polyurethane |
| Warranty | 1 Year |
| Delivery Time | 15-30 Days |
| Packaging | Neutral Export Packaging |
| Custom Service | OEM & Custom Design Support |
Aftermarket catalogues describe the stop with an outer diameter of 58 mm, a height of 92 to 93 mm and two inner diameters, 18 mm and 27 mm. The double bore is intentional: the lower part rides on the damper rod with the tight 18 mm fit, while the wider 27 mm section registers against the spring seat and the damper collar above it. Febi 38573 lists 92 mm height at 0.078 kg, and Sasic 2650265 lists 93 mm. The Bonpora drawing data of Φ18.6 x Φ62 x 91.4 mm is measured at its own reference points, and small differences between sources are normal because a fitted stop sits slightly shorter under preload. Match the new stop against the removed part before fitting a full batch.
The OE stop and the main aftermarket equivalents are produced in polyurethane or rubber. The material decides how the stop ages under repeated compression, oil contact and weather.
| Property | Polyurethane | Conventional Rubber |
|---|---|---|
| Compression set | Low; working height is retained after repeated impacts | Higher; flattens with age and load cycles |
| Oil and grease resistance | Good | Limited; swells and softens on exposure |
| Ozone and UV resistance | Good | Limited; surface cracking over time |
| Temperature behaviour | Stable across a wide range | Hardens in cold, softens in heat |
| Load consistency | Nominal rate holds between batches | Varies more with age and temperature |
| Typical role | Primary replacement line for export stock | Standard duty, price driven demand |
Rubber remains serviceable in mild climates and standard duty. Polyurethane keeps its working height longer under repeated compression, which decides how soon a loaded saloon starts to knock at the front axle.
When the marking is still legible, ordering by OEM number is the most reliable route. The number appears as 2043230044, A 204 323 00 44 or 204 323 00 44 64, and all written forms identify one Bonpora reference, 4110139. For orders that span several vehicle families, the polyurethane bump stops range groups references by system and model and shortens the quotation process. Note that Febi and Sachs kit listings also quote A 203 323 02 92 from the W203 generation and A 212 323 03 92 from the W212 alongside this number, so buyers holding those references should confirm bore, outer diameter and height before assuming one common article.
Front strut service is usually booked as one job, so European suppliers sell the stop together with the dust boot. The Febi kit 014 640 0006 contains two buffers and two protective bellows, Monroe sells the set as PK301, GSP as 5406510PK, and Bilstein lists a B1 service kit under 11-270706. Bonpora supplies the buffer alone or together with matching boots, and a combined kit usually carries a better margin than two loose articles.
Around the stop and the boots, the same platform consumes top mounts, coil springs, stabiliser links and control arm bushes. The chassis and suspension parts range covers these groups, so a container can be built around complete front axle service kits for W204 and W212 fleets.
This bumper is manufactured in China for wholesale distribution as a catalogue item with existing tooling, with pricing structured for carton, pallet and container quantities. Typical buyers include Mercedes specialists, suspension and rubber importers, and distributors serving taxi and fleet operators across Europe, the Middle East, Southeast Asia, Latin America and Africa. Orders ship in neutral export packaging by default. Delivery time is 15 to 30 days depending on volume, the warranty period is 1 year, and samples can be arranged to verify bore, height and hardness before a bulk commitment.
Each production batch is checked for bore, outer diameter, overall height and material hardness, with visual inspection for flash, voids and surface defects. Dimensional records are kept per batch, so repeat orders match the approved sample. That traceability supports the 1 year warranty.
Beyond the catalogue part, the same production line supports OEM and custom design work: adjusted hardness, modified bore, outer diameter or height, coloured material, branded packaging and private label marking. For a custom project, send a drawing or a sample with the expected annual volume; a first article sample confirms fitment before production begins.
Replace the front bump stops in pairs and inspect the dust boots, the top mounts and the front dampers at the same time. The work is done at the strut assembly: the coil spring is compressed with a proper spring compressor, the old stop is released from the damper rod, the seat is cleaned and the new stop is pushed fully home against its shoulder, with the boot correctly located. A light coating of grease on the mating surface eases assembly, and a stop seated unevenly wears on one side and can generate noise.
Catalogue data covers the C-Class W204 saloon (2007 to 2014) and the S204 estate, the C204 coupe from 2011, the E-Class W212 saloon and the C207 and A207 coupe and cabriolet (2010 to 2017), on the front axle only, one piece per side. The number on the removed original or a VIN check should confirm the order.
The stop has a stepped bore. The tight section, about 18 mm, guides the stop on the damper rod; the wider section, about 27 mm, registers on the spring seat and the damper collar. Both figures describe one article, not two versions. Bonpora 4110139 follows the same stepped geometry with a nominal 18.6 mm bore at the guide section.
The three numbers belong to the same Mercedes-Benz part group for front suspension buffers across the W203, W204 and W212 generations, and some aftermarket kits list them together. The dimensions are close but not identical for every generation, so buyers holding a 203 or 212 reference should match bore, outer diameter and height against the removed part rather than order by number alone. The Bonpora reference for this article remains 4110139.
Yes. OEM and custom design support covers adjusted hardness, modified dimensions, coloured material and private label packaging. Delivery time is typically 15 to 30 days depending on quantity, packaging is neutral export with branded options on request, and the warranty period is 1 year. Send a drawing or a sample with the target annual volume to receive a quotation.
Send the OEM number 2043230044, the Bonpora number 4110139, the quantity and the destination port, and the sales team will confirm specification, packing and delivery schedule. Buyers comparing several sources can review the full auto parts line, which covers suspension, steering and rubber components from the same factory.
