Hi all, I could really use some thoughts on replacing this island fixture.

The NM comes out of a load-bearing beam covered in 3/4" drywall. So 3/4" is the max depth of a box I can put here, because more holes should probably not be drilled in the beam. The wire is centered correctly for the island. Unfortunately when I took down Fixture 1 there was no box for the light, just a little bracket with wires coming through. Not only does it need a box, that bracket would not support the 20 pounds of the new fixture.

Okay, time to install Fixture 2. This came with no instructions whatsoever.

It has a long bracket which, it seems, cannot be mounted in the center. So I am not sure what kind of box it "wants" to attach to. Plus, it has a ground wire coming out one side that also does not reach to the center.

Even if I buy a new box I cannot figure out how to attach Fixture 2. It's almost like it is meant to be attached to two boxes. It will be a huge hassle if I have to move the wiring so that it's no longer centered to accommodate this, and it's hard to imagine someone designing one this way, but I'm just not sure. This is the first fixture I have switched out and it's proving very challenging.

Pic attached of the bracket for Fixture 2 ...