Front fenders different?

The metal fenders and quarter panels, I am not sure if the interior liners changed but I would assume so....

I've never heard of a change in the rear fenders,(I guess it is possible) but I do know the front fenders on the 91-93 cars, V8 and 4 cyl, have a larger opening. I know for a fact the front edge of the wheel opening is about 1" larger and the lower fender extension is also shorter, that attaches to the front bumper. Also, one guy on here said the rear looks to be about 1/2" wider also since his GT effects would not fit right with a pre 91 fender. But the only difference I can confirm is the front part of the fender.

Upgrading to the newer style front end is popular, I believe they bolt righ on with no issues at all. I have had buddies that have swapped over and they didn't have to drill any new mounting holes.

91-93 fenders and quarters were bigger, the inners and G effects are a different size but not by much. i have 91-93 fenders on my 87 and i am using all stock G effects and inner fenders with no problem at all.