Rear window seal problems

I am in the process of replacing my rear window seal on my 1972 Dart with a vinyl top. I ordered a replacement seal from Steele. When I put the glass into the seal per the instructions (1st step) the seal appears to be too large and won't stay on the glass. It will bunch up in the last section and not stay on. It seems the old seal held the glass pretty firmly by itself before it was installed onto the pinchweld. Has anybody experienced this issue before? Perhaps I need to try a...

Rear window seal problems
Author: admin