Dan,
Actually post GS/Skylarks used one type door panel, the Specials are a little "cheaper", with a embossed foil emblem in them and the vinyl embosing goes horizontial unlike the post Skylark/GS style
Also just a FYI: I have seen hardtop panels mounted in a Post car, though to do this and make it work out, you would need to use a hardtop back seat and filler panels as well
Regards,