I just pushed my 'new' 1970 Ranger LB 390 C6 farm truck 2300 miles east from Arizona...long drive. Took a chance on the PO's engine, tranny, and brake rebuilds and fortunately it worked out...mostly

Mechanically the truck is a good runner, rust free, but lots of work ahead. Current projects include rebuilding the Western side mirrors, crafting a vinyl headliner (parchment), new hood, bench seat from a 2000 SD crew cab, straighten/paint rear bumper. All small stuff before I get setup to start pulling panels, doors, bed to rust-proof, block, prime, and paint.
Between reworking the seat, mirrors, headliner, hood - and buying a couple of spare doors, instrument cluster, etc while I was in Arizona - I lost one of the rear bumper carriage bolts!!! No big deal I thought, except that I can't find one anywhere.
Its a 9/16"-12, 2 inches long. I've got the nut, no bolt, and a freshly spruced-up bumper with a square hole in it. Grainger, Fastenal, ACE, NAPA, HD, Bolt Depot...nobody home.
Anyone know where I can find this bolt?