ROOF RAIL SEAL QUESTION

Where do you guys get your roof rail seals ? I bought a pair & they don't seam to fit all that great. Its nice to have new seals that are soft but it think they are to soft. It makes it hard to work with. I just cant seem to get them on the way there suppose to be. They are a little different from the originals. I have put on ones for B bodies & E bodies & never had a problem but all the A bodies I have done I always have problems with them. Also I cant seam to find the right seals that go on the rear of the door glass. It seals the door glass to the rear side glass.