Corrections:

"Cool, I just saw the thread. A couple of corrections and things to think about:

The S and CL 500 caliper does require washers. four on each bolt. with four washers there is still lots of bolt threads. I never used longer bolts. Look at the back of your wheel and see if clearance increases as you go out further to the rim. I had very little clearan with my 330 set up but clearance increased when I went to 345. Any SLK stuff will bolt right on. even the R171 SLK55. I am using SLK55 rear rotors which are 330. I am using CL65 rear calipers but it took a custom bracket. Anything from a C, CLK or SLK will bolt right on with no need for washers. there is no reason to dislike the washers, especially when you can get the same caliper as the C32 for a lot less money."