Used driver (left hand) side brake shoe adjustor for Mercury Cougar or Ford Mustang. This screw assembly is part of the manual and self adjusting system for your drum brakes either front or rear. These have right and left handed threads depending upon which side of the car they are intended. Left side screws are identified by an "L" on the end of the screw under the socket and a single groove machined into the pivot nut. Original Ford part number for the passenger (right hand) side is C2OZ-2041-A, and the driver (left hand) side is C2OZ-2041-B. Clean Western part with no heavy corrosion like you see on Eastern cars.
Ford part # C2OZ-2041-B, for the driver side.
*Installation Tip* Prior to installation, add a small daub of grease to the threads and under the socket to help the self adjusting mechanism.