I looked but could not find any definite information. I am looking to swap a fender from a 92 rs (w/ ground effects) onto my 85 iroc (w/ ground effects). Will anything have to be modified to get it to work? I know that you may have to drill holes when the cars don't have ground effects, but mine and the other car do. So will it be a direct swap?

 

You should fine with the back of the fender. I'm not positive about the front but it should be the same.