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The R107 shared many parts with other Mercedes-Benz models of the 1970s and 1980s. Knowing what interchanges helps when a part is scarce or expensive. The golden rule: always confirm by part number, not by appearance.
Shared parts by system
Engines
- M117 V8 (450SL, 500SL, 560SL): shared with the W116 450SE/SEL and the W126 500 and 560 models. Many engine parts, sensors and gaskets interchange within the same engine version.
- M116 V8 (350SL, 380SL, 420SL): shared with W116 and W126 models with the same engines.
- M110 six (280SL): shared with the W116 280S/SE and W123 280E.
- M103 six (300SL): shared with the W124 and W201 300-series models.
Engine parts differ between years and injection systems, so match the engine number.
Fuel injection
K-Jetronic and KE-Jetronic components such as fuel distributors, warm-up regulators, injectors, fuel accumulators and pumps are shared with W116, W123 and W126 models of the same engine and period. Match the Bosch part number. See KE-Jetronic.
Brakes
Many brake components, such as calipers, pads and discs, were shared with W116 and W123 models of similar years. The 1985–1989 cars have different front brakes. Check by part number.
Suspension and steering
The R107‘s front suspension and steering share design and many parts with the W114/W115 and W116 families. Bushings, ball joints and tie rods often interchange, but some are specific to the R107.
Switches and relays
Many relays, such as the fuel pump relay and the overvoltage relay, are shared across Mercedes models of the era. Some switches, such as window switches and climate control components, are shared with the W116, W123 or W126. See OVP relay.
Differentials
V8 differentials with the same case size and ratio are shared with W116 and W126 V8 models. See axle ratios.
Caveats
- Part numbers matter. Similar-looking parts can differ in fittings, lengths, ratings or calibration.
- Years matter. Mercedes changed parts during production.
- Markets matter. US and European cars differ, especially in emissions and lighting.
- Body parts are mostly R107-specific. Panels, trim, glass and the soft top are unique.
How to check interchange
- Find the part number on the old part or in the parts catalog by VIN.
- Look up which models use the same number in the parts catalog.
- Ask a specialist supplier. See where to buy parts.
Quick answers
- Can I use a W126 engine in my R107? Engines of the same type often fit, but accessories and mounts can differ.
- Are W123 brakes the same? Some parts are shared; check part numbers.
- Are R107 and C107 parts the same? Most mechanical parts, yes; the bodies differ.
- Is a W116 a good donor? For many mechanical parts, yes.
