I've never seen these, before. The hoses seem to be a smaller diameter at the ends which would attach to the heater core?
https://www.ebay.com/itm/NEW-OEM-Ford-E6TZ-18472-A-HVAC-Heater-Water-Hose-1986-F-150-F-250-F-350-4-9L/183178809930?hash=item2aa64ed24a:g:HtYAAOSwYtla0jJ6