Removing seatbelt

1st gen lumina. I want to replace everything on my passenger seatbelt. It hangs loose and doesn't fully retract. I've had the door apart and had the lower part (inside the door) off of the door to remove a coin that was jammed in the mechanism once, but I never could figure out how to remove the top part of the seatbelt (up at the top of the door by the window) It's got a black plastic piece that looks like it could come apart but I've yet to figure out how.

You pry the plastic cover apart on the belt loop....there is a 50# torx bolt behind it...