55 56 57 New Drivers and Passenger sides doors glass window $310 pair Regulator. Regulator assembly for a 55-57 2 door hardtop or convertible. This is the mechanism that raises and lowers the door glass. The inside window winder handle fits onto this piece. Fits only 2 door hardtop & convertible. I paid $340 plus $30 extra for shipping plus tax. Call 801-836-8730