Scared to pull the trigger on weatherstripping

Man, I am SO with you on this one. I have a 66 valiant (4 DOOR). Years ago, I bought Windlace from Laysons, put it on, and the doors wouldn't close properly. I shimmed them out, and never did get it right, I heard lots of other complaints back then about the bulb being too big on the windlace, and everybody was having a similar problem that had bought it.

They all may have started making different material now though, I don't know. I desperately need some windlace for my car, though, and haven't been able to get a straight story from anybody that actually bought some, installed it, and had it fit right.