will wheels from a 99 grand am gt fit a 92  cav.?offset?
 
no they are the wrong bolt pattern. the j-body uses 5x100 bolt pattern, the grand ams use 5x114.3.
 
 
98 was the last year of Grand Am that had the same bolt pattern as the j-body.  99 is when the n-body fattened up and went to the larger bolt pattern.