It's not a Ford part, MH manufacturers normally use third party components for the HVAC since the chassis only comes with the AC compressor installed. Evans Tempcon is one of the company's. I believe this is what your looking for.
Evans Tempcon, Inc
If that is what your looking for make sure the new valve is installed for the correct flow position. Being installed wrong can cause them to fail prematurely.
Chuck & Teri, 1999 35 ft. Dolphin 5350, F53 Chassis with tag axle, Chassis build date 1/99 in Mexico, Banks System, Trans Command, Air Lift Air Bags on rear, Koni Shocks, Blue OX TruCenter, TigerTrak track bars front and rear, Roadmaster 1-3/4" rear auxiliary sway bar, 2013 VW Passat TDI SEL Premium, 1994 36 ft. Avion 5th Wheel. FMCA #F430129