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A used steering box that fits one vehicle won't always fit another - even within the same model range. These questions help breakers match stock to your exact vehicle before they quote:
The Mercedes-Benz ML uses a rack-and-pinion steering system, not a traditional recirculating-ball steering box — so a steering box as a separate unit does not exist on this model. What you are most likely looking for is the steering rack (also called the steering rack and pinion assembly), which is the equivalent component on the ML. Ask your breaker for the steering rack rather than a steering box.
The W163 generation ran from 1998 to 2005, and steering racks from within this generation are generally more likely to be compatible with one another than parts crossing into a different generation. However, there were running changes across the production life, so you should confirm the exact part number against your registration with the breaker before buying. Never assume fitment purely on year alone within a generation.
The W164 generation replaced the W163 in 2005 and is a substantially different vehicle with a different front subframe and steering geometry, so the steering racks are not a straight swap between generations. If your vehicle is a W164 (2005–2011), make sure the breaker quotes you a rack from that generation specifically. Always confirm against your registration plate.
Engine size can influence the steering system on the ML, particularly because heavier or more powerful variants may have different power steering rack specifications to suit the extra weight and output. You should tell the breaker your exact engine variant alongside your registration so they can check the part number rather than assuming all ML steering racks within a generation are identical. Do not assume cross-engine fitment without that confirmation.
Trim level alone does not determine which steering rack your ML needs — fitment is driven by the generation and engine variant, not whether the car is SE, Avantgarde, or Sport. You may encounter minor differences in associated components (such as steering column shrouds or switch gear), but the rack itself is not trim-dependent. Focus your search on getting the generation and engine size right, and confirm against your registration with the breaker.
The W166 is the third-generation ML, introduced in 2011, and is a different platform from the W164 (2005–2011), so the steering racks from these two generations are not interchangeable. Always specify which generation your vehicle belongs to when contacting a breaker, and ask them to verify the part number against your registration. Crossing a generation boundary is a firm reason to check, not assume.