DLook

OK, so how do you get these things to fit? I just got hold of a set of 18" Turbo Twist off a 993. Front is 18x7.5 Et 5 and rears are 18x10 Et 65. Tires are 225/40-18 and 265/35-18. I have a NB 1990 964 C2. I tried to mount the rear wheels and no go, major rubbing on the inside. Do I slap on a set of 15mm spacers and call it a day? How about the fronts, do I need spacers too? I know they fit as I've seen many with that set up. I was about to purchase the spacers then I thought it's best to check with you guys first :-)