Uh, Im pretty sure that the Z71's have been six lug for ever.
But the 2wd silverado and sierra have wheels that look identical and are 5 lug. The only downfall there is that the lug pattern is different anyways. I think its 5 on 5 and mine (95 blazer) is 5 on 4.75.
But there are a bunch of older cars and trucks that have the 5 on 4.75 bolt pattern. If you look around Im sure you will see some type of s10 with Iroc wheels on it.
The other thing you want to pay attention to is offset. Check out
www.tirepackage.com they seem to have some pretty good deals. Although Ive never bought from them.