This is a new old stock genuine Ford, heater temperature regulator valve. Comes in the original FoMoCo box with part # B7A-18502-A. This part is mint N.O.S. and never installed. Fits: 1958 Edsel; 1957 - 1958 Ford passenger (not sure if that includes Thunderbird); 1957 & 1958 Mercury. 

Ford Fairlane Skyliner retractable coupe Victoria sedan hard top hardtop town club Sunliner ranch Del Rio Country Squire station wagon Custom 300 Monterey Montclair Turnpike Cruiser Phaeton Commuter colony T-Bird Y-block Voyager Park Medalist Ranger Pacer Corsair Citation Roundup Villager Bermuda