Help identify sunroof part
 

Can anyone tell me what the piece is called that is the black long panel that moves up and down when you open or shut the sunroof on a 90 420sel. My failed to pull down when the sunroof was closing and I think my wife tried shutting the roof on it and caused it to break. It still stays in place, but has to be moved manually and doesn't stay in place as tight as it should if not broken. Does anyone have one that I could get a good deal on? Are they hard to replace?