Everything fits. Tell the guy at the junkyard that a guy on the forums says he dont know what the hell he is talking about! The quarter panels on your car are different which includes the little window, and yes, they too can be swapped out for 95 quarters. The fenders, the doors, the bumber covers and guts, the grilles, the roof, trunk lids, tailights, headlights, glass, wheels tires, shocks, springs, frame, all that you find in the junkyard you can use on your car, Impala SS, Caprice or not, it will fit. 91-96, all the same car. Like I said, the only difference other than mirrors on doors and chrome strips on bumpers and other cosmetics that can be changed are the quarter panels. If you really wanted to, you could change them too and have your car look like a 94-96.
Good luck, post us some pics of your ride.