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The 1K0412303G strut bump stop is one of the highest-volume front suspension buffers in the European aftermarket, serving Volkswagen, Skoda and SEAT platforms built from 2004 onward. Because the same OE number family covers Golf, Jetta, Passat, Tiguan, Octavia and many more models, demand for a dependable replacement keeps growing across Europe, the Middle East and South America. This guide explains what the part does, which vehicles it fits, how the Bonpora 4110059 replacement is manufactured, and what wholesale buyers should check before placing an order.
The 1K0412303G is the front-axle suspension bump stop, also listed in catalogues as a strut bumper, suspension buffer or jounce bumper. It is fitted over the damper rod of the front strut assembly and becomes active during the final stage of suspension travel.
When the wheel hits a pothole or a sharp edge, the coil spring alone may not absorb the full impact. The bump stop compresses at that moment and prevents metal-to-metal contact between the strut housing and the chassis. A healthy buffer therefore protects the damper, the spring seat and the top mount, keeps the ride controlled, and reduces harsh impacts transferred into the cabin. It works together with the dust cover, so both parts should be inspected at every strut service.
The 1K0412303G belongs to the 1K0412303 part number family, where the final letter indicates the design revision and height. Earlier versions such as 1K0412303B and 1K0412303F were progressively superseded, and the G revision now covers the broadest application range, including several models produced after 2015. For distributors this means one well-chosen stock reference can serve a very wide vehicle park. Before a bulk order, buyers should confirm the height and mounting diameter of the units currently fitted, because dimensions differ between revisions.
The 1K0412303G bump stop is fitted on the front axle, left and right side, of numerous Volkswagen Group models. The table below summarises the main applications reported by OE and aftermarket catalogues.
| Brand | Model | Typical Production Years |
|---|---|---|
| Volkswagen | Golf V, Golf VI, Golf VII and Golf VII.5, Golf Plus, Golf Estate | 2004 to 2020 |
| Volkswagen | Jetta A5 and A6, Passat B6, B7 and B8, CC, Tiguan, Caddy III, Eos, Taigo | 2004 to present |
| Skoda | Octavia II and III, Yeti, Superb III, Karoq, Kamiq, Scala | 2004 to present |
| SEAT | Ateca, Arona, Ibiza KJ, Leon | 2012 to present |
Catalogue data always recommends verifying fitment against a VIN, because vehicles with sports suspension, electronic damping or special payload packages can use different buffer heights. Stockists serving European markets should therefore keep the most common heights of the 1K0412303 family in the range, and record the reference of the part removed from the vehicle whenever possible. For mixed-container buyers, Bonpora can provide a cross-reference sheet for the complete family so the warehouse team picks the correct unit quickly.
Bonpora supplies the 1K0412303G replacement under part number 4110059, produced in a polyurethane compound engineered for European road conditions.
| Parameter | Specification |
|---|---|
| Product name | Strut Bump Stop |
| Bonpora number | 4110059 |
| OE reference | 1K0412303G |
| Dimensions | Φ18.3 x Φ50 x 91 mm |
| Material | Polyurethane |
| Warranty | 1 year |
| Delivery time | 15 to 30 days |
| Packaging | Neutral export packaging |
| Custom service | OEM and custom design support |
Traditional buffers are usually made from microcellular foam or natural rubber. Polyurethane improves on both in several measurable ways, which is why many aftermarket brands now position PU buffers as a longer-life upgrade for high-mileage vehicles.
Rubber buffers lose height and resilience as they age, especially in hot climates and in regions where roads are treated with salt during winter. A polyurethane bump stop keeps its shape and progressive curve for longer, resists ozone cracking, and tolerates contact with oil and grease around the strut. In practice this extends the service interval and reduces warranty claims for distributors.
The Bonpora compound is formulated to stay progressive from cold European winters to hot export markets. The damping curve remains predictable, so the buffer cushions the strut without turning the ride harsh. Fleet operators and suspension specialists who rebuild struts in volume often standardise on polyurethane bump stops for exactly this reason.
Bump stops are consumable suspension parts. During a strut replacement or routine service, technicians should check for crumbling surfaces, cracks, permanent compression or complete disintegration. A buffer that has turned to dust leaves visible residue inside the dust cover and around the top mount. Replacing worn buffers at the same time as the shocks avoids paying twice for the same labour and protects the investment in new dampers. Workshops that service Volkswagen platforms in volume can source matching buffers together with on-road vehicle suspension parts from one supplier.
The buffer slides over the damper rod inside the dust cover before the strut is assembled. Technicians should never force a dry buffer onto the rod; a light coating of suitable grease makes assembly easier and prevents tearing. Torque the top mount to the vehicle specification and confirm the buffer sits centred over the rod.
Bonpora manufactures suspension buffers in-house, from compound mixing to tooling and final inspection. Standard references such as 4110059 are kept in regular production, while the engineering team can open new moulds for references that are still missing from the catalogue. Minimum order quantities are flexible, so importers can start with a trial pallet and scale up to full container loads.
Beyond catalogue parts, the factory supports custom suspension parts: customers can send a sample or a drawing, receive a dimensioned proposal, and have a dedicated mould produced. Material hardness, height and logo marking can be adapted, and neutral export packaging or customer-branded boxes are available for private-label programmes.
Every production batch passes dimensional checks against the reference drawing, hardness verification and appearance inspection. This is how the 1 year warranty promise is backed by stable batch quality, order after order.
To receive a quotation for the 4110059 strut bump stop, contact the sales team with the required quantity, the destination port or country, and any packaging requirements. Standard delivery time is 15 to 30 days depending on order size, and mixed containers with other bump stops, dust covers or mounting bushes are welcome. Samples for dimensional verification can be arranged before mass production.
Request a quote today: send the target quantity and destination to the Bonpora sales team and receive FOB or CIF pricing, neutral packaging options and a confirmed production schedule for the 1K0412303G replacement.
It fits the front axle of a wide Volkswagen Group range, including Golf V to Golf VII.5, Jetta, Passat B6 to B8, CC, Tiguan, Caddy, Eos and Taigo, plus Skoda Octavia, Yeti, Superb, Karoq, Kamiq and Scala, and SEAT Ateca, Arona, Ibiza and Leon models. Because some versions use different buffer heights, fitment should always be confirmed with the VIN or with the reference of the removed part.
Yes. Bonpora offers neutral export packaging as standard and supports private-label boxes, printed bags and logo marking for qualified order volumes. OEM and custom design support covers both the part itself and the packaging.
The final letter marks the design revision, mainly the buffer height. G is the latest and widest covering revision, superseding references such as 1K0412303B and 1K0412303F in many applications. When in doubt, match the height and the mounting diameter of the part removed from the vehicle.
Delivery time is 15 to 30 days after order confirmation, the warranty covers 1 year, and packaging is neutral export packaging by default. Trial quantities are accepted, so buyers can verify quality and fitment before scaling up to container volumes.
