Also Fits 1937 Commercial, and 1932-1935 Passenger Car & Pickup Truck
This bolt has a longer shoulder that must be machined 1/16" for use on old steel drums. These bolts must be swedged under 30 to 40 tons of pressure & should be done by an expert at a machine shop.
The longer shoulders are designed for the cast-iron drums. 1928, 1929, 1930, 1931, 
Also 1937 Commercial, 1932-1935 Passenger & Pickup.