We just picked up a 73 Challenger and started going through it to see what we need to do for repair. One of the things I'm coming up blank on is the window regulator assembly for the quarter windows. My daughter was messing around with the window and it fell down into the cavity, when I took the rear panel off that's when I found there was nothing holding the window in place, it was just forced into the up position by the previous owner. Does anyone know if and where to get these parts?