We got that from J C Whitney.   Fred   

Is that the rubber that goes between the glass and the ouside of the door that the glass rides on as it goes up and down? If it is, mine is shot and needs replacing.

sedandelivery, its the seal inside the upper frame that the glass rides , called a door glass run, in the Auto Krafters catalog. I am still waiting for the beltline seals, they go on top of the door. Here is a pic of the seal and the seal installed in the door.

For those years 74-80 nothing on the door's had changed.They need to update their list and they will get more sales...I'm not too sure of the 1970-73 however..

 I bought some of ebay from the seller that always has them. I think they explained the later years had thinner glass. Actually it wasnt a snug fit but they work ot. I added a little extra piece of rubber along the bottom of the window opening on the inside and the window does not rattle at all now

 So the difference is not in the door but in the glass, so they said. It seems very possible.