ss951

I'm changing from 16" Design 90 (for sale) to C2 3.6 Turbo 3-pcs 18" wheels. The new wheels have 48mm and 53mm offsets. My car should (..) have 23.3 mm all around. However, the rear wheels fitted just fine with almost no fender gap (they are 10", but should have required 1" spacers to fit like that). I looked at the part # of my rear discs and found out they are for 1987+ 951. Can these later discs be fit on the original rear hubs. The PO may have done some rear train mods.. I'm puzzled. Any ideas?

(the good thing is that I don't need rear wheels shims... also for sale <img border="0" alt="[burnout]" title="" src="graemlins/burnout.gif" /> )