Newest copy is still incorrect after pointing out inconsistencies in previous messages " This is an original 65 Mustang Shelby small block 289 fuel pump assembly. It has the correct 3911S stamped (see photo) in the casting. These are known as button top pumps and are same that were used in 65 HiPo cars.. I have included a brand new cad plated canister as well as a new fuel filter element with gasket.. These are extremely hard to locate and can easily rebuilt.. Not a original fuelpump to a GT350, 3911S stamping is only correct for non hipo engine, the two different fuelpumps are similar button top in appearance put implication is that they are the same. They are not.