You've got an eight lug hub.
It's fine to drive "normally" with seven nuts, not
recommended, but nothing bad is going to happen.
Left hand on the left side is a throwback to knock off wheels and some old military standards that required them.
Note that even Dana/Spicer discontinued using them.
You might have a look at U-techcenter/Uhaul truckpartsonline eBay storefront. This is where I get a bunch of genuine Ford NOS for cheap.
Lugnuts, studs, nuts & bolts, wire sets, all kind of stuff.
Though their older inventory is getting snapped up by restorers and resellers.
Shipping is prompt and cheap. They will combine if you make a note on your cart.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.