The car is a 1995 968 Cab (white/blue/6 spd).

I want to swap out a set of cheaper style 17" turbo twist wheels and replace them with either:

1) 2001 17" Boxster 5 spoke sport wheels (excellent shape and I have a set sitting in the garage all cleaned up and ready to mount; or
2) install a set of 17" cup style porsche wheels that came as an original option set on the car, however they would need to be refinished.

The Boxster wheels are:
front: 7Jx17 with offset ET 55;
rear 8.5Jx17 with offset ET 48

The cup wheels are
front 7.5Jx17 with ET 65 (part 993.362.124.05);
rear 9Jx17 with ET 55 (part 993.362.128.00)

My questions are:
1) Will the Boxster wheels fit without spacers?;
2)with these sizes and offsets, would the Boxster wheels fill out the wheel well area about the same as the cups wheels (I know the cup wheels are a total of 1/2 wider, but not sure of the effect of the offsets);
3) will the current front tires 225/45zr17 fit the boxster rims (the old front tire size on the Boxster wheels was a 205/50zr17)?

Any help, advice or suggestions is welcome.
(I also posted on the 968 section too).
Thanks

 

ET gives you change in centerline, and ET + wheel width tells you where the outer wheel will be. with boxster wheels, front centerline will be 10mm outer, but with 0.5'' less width, wheel outside will be somewhat in same position as it was with Cup1's.

with rears the situation is similar. Boxster wheel et throws centerline little bit further out, but when wheel is narrower, the outside wheel is somewhat in same place.