https://www.seatbeltplanet.com/c-1389341-shop-by-vehicle-ford-f-series-1976-1986-standard-cab.htmlI've thought of them for getting belts for my 1995 ranger (one has a chewed up edge)... but sticker shock!
At least they have a boatload of color/pattern options. They even will reweb old hardware if you don't mind being out of commission for a while (or get used hardware at a JY).
IIRC in some cases (states?) dealers have to fix seat belt issues free of charge (due to being mandated safety items). Don't know details though.
1984 F150: 300 L6, AOD, RWD. EEC IV / TFI, Feedback Carter YFA Carb. Stock everything but radio (for now).