Are you talking about the seal that seals the door glass to the post? This rubber just pulls out of the C-shaped track and is carefully pushed/pried back into the track. There is a plastic push clip that pulls out of the pillar at the bottom end, and is the starting point when installing the seal. There is a seal behind the track, and another foam seal behind the L-shaped chrome cover between the track and the pillar. The track seal came attached to the rubber I installed, though it took me a while to realize I had to cut it off the main seal in order to install it. Be careful when tightening the track if you have it off. The screws can bend the track as the seal compresses. Don't ask me how I know. The pain in the butt part is having to trim the excess at the top end to match to the soft and hard top seals.