| This is the lower channel felt or glass channel run that you don't see. It's down inside the door and it's a must to have. If you don't use these in your z, you could break the window when you close the door. It also helps keep the window in position so you can roll it up and down without binding which can bend your window regulators. Not having one installed in good shape can also sometimes cause you to break a door glass when you shut the door. This piece is not used on all 2+2 models or the 77-78 coupes. Last update 04/11 | 
