Thanks coker91! Does your 66 have 3 sets of seat belts? If so, I think it would require 6 bolts... maybe this explains your other holes? http://img716.imageshack.us/img716/984/1960accessories103.jpg shows how they went into a 1960...


1965 C-10 Longbed (soon to be Shortbed) Fleetside
230-6banger, 3 on the tree
My Build-Blog http://65c10tion.weebly.com