As I understand the fitment goes like this. 38 std is by itself, 38 Del and 38 std are alike, 39 del and 40 std and del are alike except taillight set up. Hopefully someone will correct me if I'm wrong. These will all pertain to coupes, cabriolets ,not sure if there are differences on the sedan,conv. sedans, but I think there may be regarding 38's, possibly 39 conv sedan.All 40 cars interchange.Hope this helps some !