EVERY 1st gen I have taken apart has had a narrow foam strip about half as wide as the weatherstrip channel and it is kind of "goooo-ey".
My research indicates the original is a polyurethane impregnated foam seal... I have seen NOS pieces for sale in the past and it looks nearly identical to the set up I have used in restorations and is shown below.
I used a open cell foam and then took a paint brush and coated polyurethane sealer into it then applied. It seals well with no wind leakage.
FWIW 2nd gens used a black foam the width of the trim much like shown above.
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68 GTO HO 4 spd Alpine Blue /Parchment 2 owner car
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71 Corvette LT1 42k miles Original paint - Black - black leather - only black LT1 known to exist.
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Last edited by firstgenaddict; 09-27-2020 at 08:06 PM.
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