Where is the best place to get rubber door seals that really flexible? I just put the ones I got from LMC on the passenger side of the 70' GMC I'm restoring. I hung the door and got everything lined up perfectly and closing with light pressure. Then I installed the rubber and as usual I have to slam the door hard to get it to latch all the way in now.

Thanks


1949 Chevy 3600
1975 W-25 Hurst Olds
1970 GMC 1/2 ton Fleetside
2010 Chevy Silverado