upgrade wheels for my 1988

I have a 1988 and would like to upgrade my wheels from 16" to 17 or possibly 18's on the back and 17's on the front. Are there any limitations that I need to be aware of? Thanks fo your help!

You can use the stock wheels of the next size up but you'll want to buy a spacer kit to keep everything kosher. I believe it's not the height of the tires but the backspacing that comes into play.

http://www.ecklers.com/product.asp?pf%5Fid=A4105&dept%5Fid=263&mscssid=5PR30SGV8GSL8P6V2QDJ702BP6490B66

copy and paste the above link.