Hey, OE Parts Headquarters here. We have some Motorcraft heater control valves in stock ready to be shipped. They will fit all 1986-1993 F150's, 250's, 350's and 1990-1993 F-450's. The link below should take you to our site and display the part.
The heater control valve is a YG229 and is in stock for $16.01 each
This is a genuine Motorcraft part and has a one year manufacture warranty. Also know that orders over $75 will ship UPS ground for free.