You are buying one (1) NORS Auveco window component. It is a vent window latch knob, pin and screw for various 1949-1957 Buick & Cadillac; 1953-1957 Chevrolet, Oldsmobile & Pontiac vehicles. You are buying one (1) knob, one (1) screw one (1) spring and one (1) pin as shown in the photo.
We do not have the body codes so you must compare your application to the photos and to the sizes that we have provided.