I was getting ready to put tires on 99 Grand Am wheels next week and now when I looked at them again I noticed they say they're 52mm ET(offset). This will not work on an 89 Delta 88, correct?

They're nice 5 spoke 16" GA Stockers, 6.5" wide.

Meant Grand Prix rims not Grand Am. Grand Am Stock rims are 42mm. Mine are 52mm et

The best way to tell, obviously, is to put a set on the front and see if they hit the brakes. If they do, you can get similar 5 spokes off of a 94-96 Grand prix that will fit. They look the same, but have a much larger offset.