67 specific manual steering box mounting bolts

here's a question: does the manual box have a recess for the split washer like the power box? or is it just flat, thus the reason for the (seemingly) larger conical washer?

also, is there enough meat on the head of the 6-point to engage or properly? the radius(?) of the 12 point head is broader and catches more of the washer.

either way: red loc-tite suspenders to go with!