Cheap Mercedes-Benz SL Steering Box

The Mercedes-Benz SL is a rear-wheel-drive grand tourer and, depending on the generation, can use either a recirculating-ball steering box or a rack-and-pinion system — so the answer depends on which generation you have. Older generations such as the R107 (1971–1989) and R129 (1989–2001) used a recirculating-ball steering box, whereas later generations including the R230 (2001–2012) and R231 (2012–2022) moved to rack-and-pinion steering and do not have a steering box at all. If you own a later SL, the part you are most likely looking for is a steering rack, not a steering box — let your breaker know your exact registration so they can confirm which system your car has.

The R107 ran from 1971 to 1989 and broadly shared the same steering box design across its long production life, so there is a reasonable chance of compatibility within the generation. However, engine size variants — from the smaller six-cylinders through to the larger V8s — can affect the specification of steering components, so confirm the engine size of the donor car matches yours. Always check the part number against your registration with the breaker before purchasing, as running-gear components can carry mid-run updates that are not obvious from the outside.

The R107 (1971–1989) and R129 (1989–2001) are separate generations with different chassis, suspension geometry, and steering setups, so direct interchangeability is very unlikely. These are fundamentally different cars and the mounting points, shaft dimensions, and hydraulic connections will almost certainly differ. You should treat these as non-interchangeable and confirm with a breaker who can cross-reference part numbers against both registrations.

The R129 SL was produced from 1989 to 2001 and used a recirculating-ball steering box throughout its run, but the power-assist calibration and specific unit fitted could vary depending on whether the car had a six-cylinder or V8 engine, as heavier and more powerful variants can carry differently rated components. It is worth telling your breaker both your engine size and your registration so they can match the correct unit rather than assuming all R129 boxes are identical. Never assume a box from a 300SL will be a straight swap into a 500SL without that confirmation.

For the generations that had a steering box (R107 and R129), trim level in itself does not determine steering box fitment — what matters far more is the engine size, since this influences the weight and power the steering system has to manage. An AMG variant may carry a different specification of steering component compared with a standard SL of the same generation, so treat AMG models as a potential exception and confirm with the breaker against your registration. Cosmetic differences between trim levels are irrelevant to fitment here.

The R129 received a facelift in 1995, and while this update brought various changes to the car's appearance and some mechanical refinements, whether the steering box specification changed across that boundary is not something that should be assumed either way. Name the 1995 facelift to your breaker and provide your full registration so they can verify whether a pre- or post-facelift unit is required for your car. Routing this question to the breaker with your reg is the only reliable way to confirm compatibility across that boundary.