Model A Pick Up rear window gasket question

Here's a question for the brain trust here on the HAMB.
I'm putting the back glass in my 30 model A pick up.
I'm using a new U-shaped gasket from Mac's (very good quality) but the corners kind of "pucker up"when I install it on the glass.
Question is, do I cut the gasket a little short, pulling it together and stretching it as I put it in the frame or do I just cut it so that it covers the perimeter of the glass? Cutting the gasket little short and pulling it tight seems to fit better but it makes the pucker worse.
I think a little heat might make the corners lay down flat but I'm not sure which way will work out better.

Any suggestions?


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Curious about this too. I have a chopped 32 cab that looks like will have the same problem.


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Cut it a little long as it will shrink a bit. Glue it with super glue. When you press it into the opening the corners should flatten up against the glass. Cut to the top.

 

Once you put it into the opening, and install the inside trim piece, very little of the gasket will be exposed.Try a "dry run" first and check it out ( and not to sound like a smart-ass,I always put the joint in the gasket at the top center of the glass)

 

Thanks guys! I was going to cut the gasket short. That would have been a mistake.