Sometimes I do dumb things, you can decide.
I'd determine whatever I wanted to bolt on there,
hold it in place, stick a 1/4" drill bit in the hole,
measure the depth from where it bottoms to the surface of your hitches, etc.
and use a bolt with enough threads that is 1/8 to 1/4 inches shorter than your measurement.
Hacksaw if you must, but that's me
input.