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Every strut assembly depends on one small elastomer component that nobody notices until it fails. On the front axle of the Mitsubishi Lancer CS and the first generation Outlander, that component carries the OEM number MR961189. This guide explains what the part does, which vehicles it fits, how its dimensions compare with catalogue data, and what overseas buyers should confirm before ordering strut bump stops in bulk from a Chinese manufacturer.
Mitsubishi parts catalogues list MR961189 as a strut bumper or front suspension damper bumper, and independent catalogues such as FEBEST classify it as a front shock absorber jounce bumper. It is the progressive cushion mounted on the piston rod of the front strut. When the suspension reaches full compression during a hard landing, a pothole strike or an overload condition, the bump stop compresses and absorbs the final part of the travel so that the strut internals never meet metal on metal.
The MR961189 sits on the front strut rod, inside or above the dust boot, and works together with the dust cover to keep grit away from the rod seal. Catalogue data places it on the front axle, left or right side; the part is symmetric, so one vehicle uses two identical units. A worn or missing bump stop lets the strut bottom out harshly, which accelerates seal wear, damages spring seats and produces a distinct knocking noise over rough roads.
MR961189 belongs to the generation of Mitsubishi front suspensions built on the CS and CT chassis codes and the CU crossover platform. Fitment spans a long production window, so distributors should always confirm the OE number against the vehicle chassis code before ordering.
The ninth generation Lancer, sold in Japan as the Lancer Cedia and in Europe as the Lancer or Lancer Classic, uses chassis codes CS1A through CS9A for sedans and hatchbacks and CS_W codes for the Lancer Cargo estate van. In North America the same platform was sold as the 2002-2007 Lancer in ES, LS, OZ Rally, Ralliart and Sportback trims with 2.0L and 2.4L non turbo engines, and the official Mitsubishi parts catalogue lists MR961189 as the front strut bumper for those models. The CT9A body, which forms the base of the Lancer Evolution VII to IX, also appears in European catalogue listings for this reference.
The first generation Outlander, launched in Japan as the Airtrek, shares its front strut architecture with the CS platform. Catalogue fitment covers CU2W, CU4W and CU5W bodies from 2001 to 2008, including the European Outlander I wagon variants ZE and ZF.
North American catalogues specify non turbo 2.0L and 2.4L applications, while European aftermarket catalogues group additional variants under the same reference. Because fitment can vary by build date, trim and destination market, the reliable rule for distributors is simple: order by OE number, not by model year alone. The table below summarises the main catalogue groups.
| Vehicle | Chassis / Body Codes | Catalogue Years | Position |
|---|---|---|---|
| Mitsubishi Lancer (Cedia, Classic, Cargo van) | CS1A-CS9A, CS_W wagon, CT9A | 2000-2013 depending on market | Front axle, left and right |
| Mitsubishi Lancer North America (ES, LS, OZ Rally, Ralliart, Sportback) | CS | 2002-2007 | Front axle, left and right |
| Mitsubishi Airtrek / Outlander I (incl. ZE, ZF wagons) | CU2W, CU4W, CU5W | 2001-2008 | Front axle, left and right |
Bonpora supplies this reference under its own part number 4110242 in polyurethane. Dimensions are 21 mm top diameter, 66 mm outer diameter and 81 mm height. Cross reference catalogues quote slightly different figures, for example 79.5 mm or 82 mm height, which reflects different measuring criteria between brands rather than different parts; the dimensional window is consistent across sources.
| Item | Value |
|---|---|
| OE reference | MR961189 (also indexed as MR 961189) |
| Bonpora part number | 4110242 |
| Product type | Strut bump stop / front suspension jounce bumper |
| Dimensions | Φ21 x Φ66 x 81 mm |
| Material | Polyurethane |
| Fitting position | Front axle, left and right, 2 units per vehicle |
| Unit weight | approx. 0.09 kg |
| Warranty | 1 year |
| Delivery time | 15-30 days |
| Packaging | Neutral export packaging |
| Custom service | OEM and custom design support |
Mitsubishi part numbers move through prefix series as the decades progress. The MB series covers parts from the 1980s and early 1990s, the MR series covers the late 1990s through the 2000s, and the MN series follows after. MR961189 sits squarely in the MR era, matching the 2000 to 2008 production window of the CS and CU platforms.
Databases store the number with and without a space. Buyers who get zero results for MR961189 should retry with MR 961189, and vice versa. The same habit helps with older Mitsubishi references where the letter O and the digit 0 are easy to confuse in printed catalogues.
Boot plus bumper kits for these platforms also reference MB303070 alongside MR961189, and the FEBEST dust cover kit MSHB-CSF-KIT crosses both numbers together with Kayaba 910164. This indicates the two references cover closely related applications within the same suspension family, so the OE number on the removed part remains the final authority when in doubt.
Original bump stops are typically microcellular foam, and many budget replacements use basic rubber. Bonpora moulds the 4110242 in polyurethane, a material class that resists ozone attack, heat ageing and compression set far better than natural rubber compounds. For a part that works by being squashed thousands of times, resistance to permanent deformation is the property that decides service life. Buyers comparing material options can review the full range of polyurethane bump stops in the same family.
A well made polyurethane bump stop compresses progressively: soft in the first millimetres of travel, firm at full compression. This keeps small impacts comfortable while still protecting the strut at maximum load. Uniform cell structure and a consistent hardness grade across production batches are the quality markers procurement teams should check when comparing suppliers.
The reference is widely listed in the independent aftermarket, which confirms healthy global demand for this application and makes it a sensible stocking line for Mitsubishi specialists.
| Brand | Reference | Catalogue Notes |
|---|---|---|
| Mitsubishi | MR961189 | Original reference, front strut bumper |
| FEBEST | MD-CU5W | Front shock absorber jounce bumper |
| MASUMA | MAD-3004 | Bump stop, catalogue height 79.5 mm |
| Kayaba | 910164 | Boot with bumper kit, crossed with MB303070 |
| Original Imperium | MR961189 | Rubber buffer, front axle |
| Ashika, ERT, Autofren Seinsa, Fare SA, Goom | listed under OEM MR961189 | Buffers, boots and repair kits |
Bonpora manufactures suspension elastomer parts from drawings or physical samples. For the MR961189 application the standard mould is available, and the same tooling route supports custom heights, diameters and hardness grades for buyers who need application specific variants. Trial quantities are welcome before volume orders, and the custom parts service covers the full development flow from sample confirmation to serial production.
Standard terms are neutral export packaging suitable for rebranding, 15 to 30 days production and delivery, and a 1 year warranty on the material. Buyers who also need matching boots can review the dust cover range, and the wider shock absorber parts programme covers mounts, spring seats and related components for the same Mitsubishi platforms.
Inspect the bump stop whenever a front strut is serviced. Cracks, crumbling edges, permanent compression or a missing unit are all grounds for replacement, as are customer complaints of harsh bottoming noises over potholes and speed bumps.
Because both front struts share the same load history, workshops replace bump stops in pairs. The dust boot is dismantled during the job anyway, so combining the new bumper with a fresh boot in one kit avoids a second teardown. Aged boots split quietly and let grit destroy the new strut seal within months, which turns a small saving into a full strut replacement.
It fits the front axle of Mitsubishi Lancer CS and CT series vehicles from 2000 onward, including the North American 2002-2007 Lancer in ES, LS, OZ Rally, Ralliart and Sportback trims, the Japanese Lancer Cedia, the Lancer Classic and Lancer Cargo van, and the Airtrek and Outlander CU2W, CU4W and CU5W from 2001 to 2008. Confirm the OE number on the removed part before ordering.
Front. Catalogues list it as a front suspension strut bumper, fitting the left and right side identically, with two units per vehicle.
Both numbers appear in boot and bumper kits for the same Mitsubishi suspension family, with MB303070 belonging to the earlier MB prefix era. Where catalogues cross both numbers on one kit, the applications are closely related, but the exact fitment should be confirmed against the chassis code and the OE number printed on the used part.
Yes. Standard references ship from existing moulds, and custom heights, diameters, hardness grades and colours are produced from drawings or samples under the OEM and custom design programme.
Send your quantity and destination port to the Bonpora sales team for a factory quotation on strut bump stop MR961189, matching boot kits and custom polyurethane suspension parts for the Mitsubishi CS and CU platforms.
