by sasktrini Sun Oct 25, 2009 10:43 am
In the absence of seatbelt mounting bolts, you can drill out a plate to take a bolt, weld a nut to the backside of it, drill a larger hole on the body / rib section so that the nut and plate will fit in there, and then weld the plate, flatside out to the body / rib section.
That's the general idea anyway. Lap belts can be added by drilling holes, and using large washers under the floor to prevent the nut from tearing through a tiny hole...
I hope that gives some ideas, and others have example pics.