I was contemplating 22's on the cl55 until I dug up some pictures (ridiculous looking on the w215) . Now I am set on Maya / Iforged color matched 20's for a 2005 Cl55.

What is the correct width and offset for the rears?

Thanks in advanced, I will post pictures when its done.

9.0"x 18= ET44
9.5"x 18= ET46

The various offsets for factory wheels are shown in the attachment. Looks like et42 front and et43 rear for 20's with 8.5" and 9.5" rim widths, respectively.