The last one you show may work?? the third one is what I kept coming up with it has a nut to hold the arm on. This won't work as my posts do not have threads. I was told the truck posts are larger than cars???? I miced.mine at .550. I guess I'll spend some time at the parts store tomorrow it's going to rain and snow here anyway. Might be someone along the way changed the posts???
Thanks for the help Denny.