Im talking about the dark round piece at the top of the rod. Its not plastic or metal?I don't know what the real name is for it, just "track" maybee? Anyway it bolts into the door vertically and then the movable plate bolts to your glass bracket and just keeps the window centered as it moves up and down.
Not sure what it's made of but it just acts as a bushing I think to prevent rattling.Im talking about the dark round piece at the top of the rod. Its not plastic or metal?