73 dart 4 door trunk seal weatherstrip troubles

I've been hunting a trunk seal for a bit now. I bought the Metro part number tk 64-a but it is too wide and too tall for the trunk. by like 1/4 inch each way. I've sent off the sample of the original to them and I'm hoping to get an answer back . my original seal is hollow but is shaped like the tk 64-a. Just much smaller. anyone else run into this problem? is the seal different than the Swinger? I know the trunks are different than the sport obviously. but I've never considered that the swinger and 4 door might be different.