I am only running 39.5" tires, so I wonder if the 1350's are going to be OK?
I'm pretty sure that my '81 Cab and Chassis GMC has a 1410 yoke on it's 14 bolt. Not positive though.
Since the cool guys are taking new strapped 1410 yokes and machining them to use U bolts, I'm going to go out on a limb and say that they came on stock trucks. (the strap version)