1936-1960
The earliest GM A-bodied based cars were built primarily by Chevrolet and Pontiac. Oldsmobile also used the A-body for the 1936-39 Oldsmobile Series F and 1940-48 Series 60. All Chevrolets produced during this period, and all 1936-39 Pontiacs, the 1940 Pontiac Deluxe, the 1941 Pontiac Deluxe Torpedo and all Pontiac Torpedos produced from 1942 through 1948 were A-bodies.
From 1949-1960, only Chevrolets (150, 210, Bel Air, Del Ray, Biscayne, and Impala) and Pontiacs (Chieftain, Star Chief, Super Chief, Bonneville,) were built on the A-body. These cars were moved to the new B Body shared with some Buicks and Oldsmobiles in 1961
Read more about this topic: GM A Platform (RWD)