69 Cuda window parts questions.

Fastback door glass parts......Ok....we've bought a kit that dosen't have the piece that goes in the rivet like in this picture(light blue piece that shoves inside the rivit).....the passenger door doesn't have one either....but it sure seems like they need them. They move alot and the newer parts just come out.

Also the black roller that goes back in forth in the metal holder how does it come off to replace it?


Thanks for the help folks.