Bought a set of Duralast from AZ but the hole diameter is too small, that is, the socket was more of a "long" socket than a "deep" one.
Took them back and bought a Sears #50758 (Craftsman) 1/2" 12-point deep. It worked as the hole diameter is large enough.
Tried a 12-point box but the 1/2" wrench size is so small that the handle flexed enough that it was obviously going to bend if I kept going. (Those fasteners have a 110# of torque.)
I'll take a picture in a moment but I'll have to have it re-sized to post here. (Don't know how to do that.)
Thanks for responding, guys.