I have a 66 mustang but it dose not have the orinal engine in it. I can't seem to fined the vin # on the engine to look up the engine. It is an early engine straight 6. I can tell you that it needed a starter the on in it was bad so I was able to match the # on the starter up to get a knew one but it gave a lot of years this starter was used for the starter is a Lester #E25F-11131-AA.