If the 16s were on a 96 grand am like you said it looks like those cars have a bolt pattern of 5x100 which explains why they didn't fit on a GP. Did GM put GTX wheels on grand ams at any point?
Who knows possibly I mean they were on a grand am. But I am sure someone bought that style rim which they liked for the grand am bolt pattern since at that time the gtx wasn't for sale yet.
If You Cant Hear The Whine You're Too Far Behind...