I would check around on Amazon.com , but here's an interesting thread on installing Recaro Topline seats in your R170 car, I think I will go this route also, and the seats match up very well from what I see.

http://www.benzworld.org/forums/r170...ats-fit-3.html

the price of the recaro topline is also about $1000


this might be a better deal http://www.speedwaremotorsports.com/...OD&ProdID=7015