67 barracuda fastback rear window trim

You have a few choices.
1) Get the 68-9 stainless rear window trim (3-500 on condition) and reveal molding clips. Replace the window gasket with the readily available 68-9 gasket.

2) Find a 67 gasket that uses the lock strip and find the factory lock strip (rare and expensive) and joining pieces or and alt lock strip. Problem with this is the lock strips shrink now same as they did 40+ years ago.