This is a new made in USA old issue king pin set . Fits 1937,1938,1949,1940, chevrolet and GMC commercial in book that is trucks including pickup truck models. on box has gm part # 603539 printed and that shows as .010 OS with lock pin bull dog part # A272
listed as fitting
- 1937,1938,1939,1940, chevrolet and GMC truck models
