I bought an old 3rd gen second hand years ago and it had a small leak on teh passenger side. My father working for Pontiac at the time gave me a tube of GM weather strip conditioner (P/N: 12345579) to make my weather stripping around the T-tops soft and plyable as it was hard and brittle at the time. it worked like a charm, may work for you. I even condition the weather stripping on my new car once a year, i had great sucess with that stuff
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