16x 7 1/2 is perfectly fine for DRs(255/50 16) and I'm sure the offset will work. I've bolted up about twenty different M-B rims(from 16-20'') to the rear of the Crossfire and every one of them fit without rubbing issues. I currently run old 220 body S-Class 16x7 1/2 rims(don't know the offset).................they do look stupidly "sunken in" the wheel wells but there' no clearance problems of any kind.