I think they are all blind holes
The parts look up calls for the right length bolts in the 3 point section.
1" W/O the 3 point (drawbar only) and 1.25 with the (inner) lower 3 point.
Add the outer lower 3 point, add another .25"=1.5"
Be safe, measure the depth to be sure.
You do not want to wreck the threads or bottom out the inside holes in the differential!
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