Windshield gasket?? convertible vs hardtop?

ok I'm collecting part for my 66 convertible's I will need 2 windshield gaskets for the cars and all I find are Sedan/hardtop not vert's.. If they use the SAME windshield just what the heck is the difference? I looked at the 4door parts car and they look the same to me.. just what is the difference..and acan I use the hardtop gasket
thanks and MERRY Christmas! to all
66dvert