As Pat mentioned, R170 is a platform designation. The R170 Mercedes included the SLK32 and SLK32 AMG (as well as others), which is essentially what Crossfires are based on. Our cars share a huge percentage of parts with the R170 platform, and for most purposes can be considered an R170 car.

The caveats are of course most things to do with body panels, and some of the suspension.

So when shopping for parts for your Crossfire, you can often shop as if the car is a 2000-2004 SLK32.