I also had the same issue and wanted to add them to my '69 Runner (if not for safety, then for the looks). If not for my December '68 build date, the car would have them right from St. Louis. But as I discovered, the original front bench already came complete with everything under the upholstery for installation of headrests from the factory, including the white blocks the chrome bezels mount to. I am going from memory here, but I believe that all you need to retrofit them is the headrests, chrome bezels and bezel screws to put them in. Before I knew this I harvested the correct hardware, headrests, blocks, I mean everything from a junkyard car. When I went to the upholstery shop, they opened up the seat (my original black vinyl was toast) and all was there beneath the surface. Check yours out!