For whatever its worth, this "black" carpet was originally from a hardtop, and the red is what I ordered that was described as fitting a convertible. They look pretty similar to me, but the black was original 1965 factory carpet. Maybe the ACC stuff is cut shorter?
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I know the seat is narrower, but it seems like the fiberglass side panels cover most of that area anyway don't they?
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I got mine from Dante's Mopar Parts in 2019. Don't remember how the price compared to anyone else, but I do know the seat covers were considerably cheaper than anywhere else including direct from Legendary, so you might check them out.