I had those 3 bolts break open, it's caused from loose bolts, not just
because the housing is "hollow" there, so I welded it solid, redrilled
the holes a little bigger, and used SAE hardware, and longer bolts that
go all the way to right next to the carrier, and loc-tite them in so they
cannot back out, no problems for 7 years now, so you can have it welded
if you want.
Wild