The stuff I call "fuzzies" goes into the door to guide your glass all the way. You buy the stuff in 6' lengths and bend it to fit the application.

I had to take my door apart to get the stuff out and remove the brackets that held it. Your truck might be different in how the channel is held, but I don't know how else to replace it without taking the door apart enough to get the glass out and the channel.

Maybe somebody else here has some tricks to doing it quickly.
[addsig]