wheel question

i just bought my wife a 944 turbo which come with the original 16, wheels and a 17, set of cups which are on it .its a 1990 car .will the cups fit my 993 as they would be nice to have as spares . I personally like my 18,s 996 bbs wheels but I know they are not every ones taste and people prefer the cup wheels .are they completely different off sets

There are 2 different rear offsets in 17" Cup2s
ref:- http://www.944racing.de/wheelweights.php
They will fit front and rear but the rear will look better with spacers on the ones with 70 offset or are they 55? I've have to go and look when it's stopped raining. I run 2 sets on my 944 S2.

thanks .that site is really helpfull