NOS GM Passenger Side Seat Adjuster Assembly.
Part #4572790 / Group No. 11.561.
This should fit && be correct for 1949 and 1950 Chevrolet and Pontiac, but please double check your sources before purchasing to make sure you are getting the part you need!
Seat track is in nice shape overall with just a few areas of light rust as seen.
Original box is in terrible condition due to years of improper storage, but will be included and shipped with part unless requested otherwise.