I have been trying to figure it out and just cant seem to figure it out. I have the big bracket that holds the wheel up and goes across it and the big bolt like stud with the rounded off head on p***enger side right in front of the leaf spring pack.
On LMC it shows a "J" hook and cotter pin with s nut but guess they dont sell it? Who does? http://www.lmctruck.com/icatalog/fb/full.aspx?Page=28
Might try Dennis Carpenter. I got the last NOS side-of-bed rack for the spare on my '61 F-100 from him.
You don't have the nut and threaded rod. Help used to offer a nut and you can buy threaded rod to cut to size. The nut was a stamped steel,shell with nylon inside threaded.