I want to upgrade my 1967 Mustang Coupe from manual steering to power steering. Someone is selling a used setup on ebay, but he doesn't know what year it came off of, just that its a "mid to late 60's Ford". His auction "INCLUDES OEM PUMP, RACK, GEARBOX, PITMAN ARM, HARDWARE". He said he bought it for his '65 fastback, but has since sold the car. How can I tell if it will indeed fit my 1967 Mustang?