I used Soft Seal's products to replace all the seals my 68 A-Body convertible. While you are at it, grab some Black 3M Super Weatherstrip adhesive.

The convertible seals are relatively easy to put in, and all their seals worked great..

https://www.steelerubber.com/convertible-roof-rail-kit-70-1928-65

1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)