Scott 657
I have one of those stock bars---out of a early 60's short, fleetside, C-10.
It is still on the frame & empty axle housing (was a box trailer when I got it years ago)--- Pm me if you are interested.
I saved the bed but the rest is heading for the crusher someday.
It is free to you if you cover the shipping expense.
delky dave in WYO