I own an 88 TII
Im looking at these:
http://www.wheelmax.com/Wheels/5zigen/5zigen.html

scroll down to the pro n1's

I was looking at these and i want to get the 17"x8 front and the 17"x9 back. How do i know though if these will fit my car? Do i need to know offset? or anything else?

 

You can "play" around with the following. You will definitely need to know the offset.
5 x 114mm or 5 x 4.5"
Factory is 7" 40mm offset.

http://toy4two.home.mindspring.com/offset.html