Well I gotta say, I have two sets of "Precision" door seals from Classic Parts of America, for my 1950, 3600 and installed one pair last summer after repainting the doors. They've been on the truck almost a year and I see no problems with them. They fit the opening nice and snug, not to tight and seal just fine, I get no air leakage and I've been out driving it at 45-50 mph in this upper midwest winter at below freezing.
I have a buddy that just finishe up a 1950 street rod version of the 3100 and the steele door seals that he bought caused nothing but trouble. They couldn't get the doors to close at all with them on the truck and finally tore them off and replaced them with another brand, which one, I don't can't tell you.
Denny Graham
Sandwich, IL