Drag Specialties Fat Bob Fuel Tanks (3-1/2 Gallon) for Harley-Davidson Big Twin 1936-1984Drag Specialties Fat Bob Fuel Tanks (3 1 2 Gallon) for Harley Davidson Big Twin 1936 1984 Need a fresh set of fat bob tanks? These are the ones to get. Easy on the wallet, this kit contains everything you need to get your bike rolling again including mounting hardware and dash shims. Fat bob style tanks Accepts stock dash and speedometer Accepts 22mm petcocks 3 1 2 gallon capacity Accepts twist lock (bayonet style) fuel caps These use the 1973 1982