so my window made a weird pop yesterday when i put it up on time and then ever since when the window goes all the way up, right as it touches the top of the door it just jumps up and down instead of firmly seating. i opened up my door today and the teeth on a half moon looking gear are eaten up right at the window would be at the top. the lady at advanced said it is the window regulator, but they dont make them apparently for a coupe? so she cant order one for me. so i guess i gotta get one at a junkyard or if someone on here has one, but what exactly should i get/replace? how would i go about replacing it too with that metal sheet in the way? thanks