This 1957 Chevrolet Rear End Housing is an original GM part. The difference between 1955-1956 and 1957, is that the '55-56 has a thicker axle bearing than the '57. Also the 1957 has a plug on the bottom.
Fits: BelAir, 210, 150, Impala, Super Sport, Biscayne
Fits: 2 or 4 Door Hardtop/Sedan, Convertible and Wagon