I have a 1976 Trillium
1300 in good shape. The door seals have been replaced. I can confirm his due to the glue spillover at the edges of the gasket. The door latches only after a forceful slam or hard push. Is the correct gasket an identifiable item who's profile might help with this problem (or is it a problem?)
My last question regarding the door seal is how the factory originally installed a seal at the threshold area. I don't have anything there currently.