The difference in coupe and convertible is your coupe will not have the rear upper well panels as shown for a convertible.The coupe uses a much smaller metal piece.The lower panels i think are slightly different in dimension but similar in style.The seat patterns are the same.The rear quarter window panel is the same style.The door panels will be the same.
David
http://FirstGenFirebird.org/show/closeup.mv?CarID=571 If i don't get this car back on the road soon i'm gonna go postal! On a quest for FGF knowledge 1968 Pontiac Firebird Convertible 1969 Oldsmobile Cutlass "S" Convertible *Sold*