Originally Posted by NumberDummy

1957/1964 is not the same as 1965! They may be selling C3UZ-18495-A which is the cable controlled heater valve for 1963/67 Econoline, 1965/66 F100/1100, 1965/69 N/NT/T500/1000, 1967/72 F100/750.

It's still available from Ford (price just went up): MSRP: $46.16 / PARTSGUYED.COM price: $27.70.

Your pal Tee Hee said that he/she used this valve as a substitute for the one on his/her '51.