Rett, the seatbelt hardware was some left over Detail Master or S&S Specialties brand from some years ago. The belt material is the tissue that comes in the old balsa airplane kits sprayed with Testors Dulcote. You can purchase the seatbelt sets on line through Detail Master or Model Car Garage. There are other suppliers but these two came to mind. Most sets come with the belt material so you wont have to make your own.