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The rear strut bump stop MR418018 is the cushion that sits on the rear damper rod of the Mitsubishi Pajero Sport family, the ladder-frame SUV sold in different markets as Challenger, Shogun Sport, Nativa or Montero Sport. At 113 mm long it is one of the taller buffers in this class, and buyers often reach it through the cross reference Febest MD-KHR. This guide covers what the part does, which chassis it fits, how it relates to the front buffer and what to check before you quote.
The Pajero Sport generation from 1996 to 2015 that this number serves runs a live rear axle located by leaf springs, with a separate telescopic damper on each side. The buffer rides on the damper rod inside the coil or on the axle-side mounting, depending on the build. Through normal travel it does nothing at all. Its work starts at the end of the compression stroke.
Load the rear of a Pajero Sport with a full complement of passengers, a loaded bed or a trailer on a rough road, and the leaf springs approach the limit of their travel. Without a buffer the spring packs would close flat and the axle would strike the frame. The MR418018 compresses progressively, adding a rising spring rate only at the end of the stroke, so it converts that final impact into controlled deceleration rather than a metal-to-metal jolt.
A rear damper driven repeatedly to full compression sees loads well outside its calibration, and its seals and valving take the strain. The buffer is the sacrificial part in that path: far cheaper to renew than a damper, and it spares the spring pack, the U-bolts and the chassis rails from shock loads. Because it is only active at the extreme of travel, ride comfort over ordinary roads is unchanged.
This is a rear axle component, one per side, and it is not handed: the same number serves the left and the right damper. European and Gulf catalogues place the part across three SUV generations, and the number also appears for the Chinese-built Pajero Sport.
| Model | Chassis code | Years | Position |
|---|---|---|---|
| Challenger / Shogun Sport I, Pajero Sport I, Nativa I | K7_, K9_ | 1996-2012 | Rear, qty 1 per side |
| Montero Sport I | K7_, K9_ | 1996-2012 | Rear, qty 1 per side |
| Pajero Sport (BJC) | K96W | 2003-2006 | Rear, qty 1 per side |
| Challenger II, Pajero Sport II, Nativa II | KH_, KG_ | 2008-2018 | Rear, qty 1 per side |
| Montero Sport II, Pajero Dakar II | KH_, KG_ | 2008-2018 | Rear, qty 1 per side |
| Shogun Sport III, Pajero Sport III | KS_ | 2015-2018 | Rear, qty 1 per side |
Catalogue fitment lists the part against the 2.5 diesel family (4D56, 4D56-T, 4D56-HP and the later 16-valve version), the 2.8 diesel (4M40), the 3.2 DI-D (4M41), the 3.0 V6 petrol in both 6G72 SOHC and DOHC 24-valve forms, the 3.5 V6 (6G74), the 3.0 MIVEC (6B31) and the 2.4 DI-D MIVEC (4N15). It appears for both the two-wheel-drive wagons and the four-wheel-drive variants, on the pickup and chassis-cab builds as well as the station wagon bodies.
The published dimensions matter more than usual here, because two different buffers look alike at a glance and only one of them is 113 mm long. The figures are also useful for confirming a match when the old part has lost its number.
The 12 mm figure is the bore of the central hole that slides over the damper rod. The 90 mm figure is the overall outside diameter of the buffer body. The 113 mm figure is the free length along the bore. A Febest MD-KHR pack measures roughly 11.2 x 9.1 x 9.1 cm and weighs about 0.255 kg, which sits comfortably with a 113 mm part once the carton and the tapered profile are allowed for.
Free length sets how much compression travel is left before the buffer goes solid. Fit a shorter buffer and the axle reaches its bump stop earlier, which limits suspension travel and leaves the damper to absorb loads higher in its stroke. Fit a longer one and the buffer is already compressed at ride height, which firms the rear end and can make the vehicle feel harsh when empty. Match the length of the part that came off the vehicle.
The most common ordering error on these vehicles is treating the front and rear buffers as one family. They are separate numbers with separate free lengths, and the rear part is the longer of the two on this platform.
Front buffers for the L200 and Pajero Sport family sit in a different size class, and catalogues list them under their own references rather than as alternatives to MR418018. If a quotation arrives for MR418018 and the buyer is working on a front strut, the number is wrong even though the vehicle line matches. Ask which axle the workshop is servicing before confirming the order.
Some listings show the same number carrying cross references from other marques that shared Mitsubishi programmes during this period, and Spanish and Portuguese catalogues list MR418018 for Pajero Sport built between 1998 and 2009. Treat these as useful matching hints rather than proof of interchangeability: the safest confirmation is still the number cast or moulded on the old buffer, or a dimension check against the 113 mm free length.
Bonpora produces this buffer in polyurethane, moulded to a density selected for suspension buffering rather than for general rubber work. The material resists the oil and ozone exposure found around a damper, holds its shape across a wide temperature band 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.
Wholesale quantities are quoted against the order volume, and OEM support is available for distributors who need their own branding 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 and lead time. Ask for the auto parts wholesale catalogue if you need to see the rest of the suspension buffer range.
Quote the OE number MR418018 together with the chassis code, for example KH4W or KS1W, and the model year. Add the quantity per side needed and the destination port. If the number on the old part has worn off, send the bore, outside diameter and free length in millimetres and we will match against the drawing.
Febest MD-KHR lists MR418018 as its OEM reference and is described as a rear shock absorber jounce bumper, so the two numbers refer to the same position on the same vehicles. The dimensions should still be checked against the 12 x 90 x 113 mm figures before ordering, because catalogue groupings occasionally collect more than one revision under a single OEM reference.
No. MR418018 is a rear axle buffer, and the front of these vehicles uses a different, shorter component in its own size class. Confirm the axle position before requesting a quotation.
One buffer per damper, so two per axle. Most workshops renew both sides at the same time, since a buffer that has failed on one side usually means the pair has seen the same mileage and load history.
Yes. Send the drawing or a sample with the required free length, bore and durometer, and we will confirm tooling, minimum order quantity and lead time before production.
Send the OE number, the chassis code and the quantity per side to our export desk and we will return a quotation with the unit price, 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: MR418018 identifies one specific 113 mm rear buffer.
