Ok...here's a brief writeup.
If you look at the lights, you'll notice the mount at the back has a "flat". That'll need to be pointed up. With the light oriented like that, the Rigid logo is upside down.
Simply remove the four Allen head bolts and the cover comes right off. The glass lens is loose so it can fall out. Once the cover is off, rotate it so the logo is right side up and re-install the four Allen head bolts. Really simple. It'd be super easy to install a yellow filter in there if you wanted yellow lighting.
For parts, I went with M6 stainless hardware, flanged. This'll allow the ridges to dig in and keep everything locked down tight. It also makes it super easy to tighten the nut as you won't need a wrench on the bolt (but there is room to do that if you go with a standard bolt/washer arrangement). I did use blue locktite on everything.
For the bracket, it's simple angle aluminum. I believe I used the 1.25" size which was perfect. You'll cut those to your desired length (I think I cut mine around 5"?) and then file the ends smooth as you'll get a lot of flashing with aluminum depending on what you use to cut it with. It's soft so it's easy to cut.
So where to mount? I mounted it outboard of the tow hooks. This keeps it away from the exhaust on the driver's side. Conveniently, there's an appropriately-sized hole on the rear frame. I've pre-installed the bolt with blue loctite for reference.
You'll need to mark and drill holes in your brackets and then install the brackets. I am using the frame beam width and the angled bracket as a support of sorts. It's mounted up against the end of the frame tightly.
From there, mount the light with the flat facing up and the Rigid logo right side up (assuming you rotated the front assembly first). It's mounted up high like this and should mostly stay out of the way for extreme rock crawling but I'll let others test that out
Wiring! This is Braptor specific in case anyone with a non Raptor Bronco finds this thread and uses it as a guide.
Step one will be to remove the passenger's side rear storage compartment panel. I pushed the passenger's side seat flat and removed the cowl plastics as well. With the rear panel removed, finding the right wire is pretty simple.
Here's a wider and then tighter shot of where the wire is. The seat belt angle, if you follow it downwards, points right at our wire which is orange/white. Note, the end of the wire is tucked in to the fabric wrapped around another main wiring harness so it looks like a loop.
For the ground, I'm using the factory connection located by the subwoofer. Man I should have bought a replacement sub and installed it at the same time!
There are several pass-through grommets on the floor of the cargo area. I like to poke a very, very small hole using a punch and with a bit of effort, pass the wires through. I don't like to cut them as the cut tends to elongate over time. This also gives you a good seal. If you're super OCD, you could use a bit of rubber gasket maker or other sealant.
They're very easy to spot on the underside of the carriage. I used the one towards the bottom left. If you follow the angle of the brake line in the second photo, you can see the oval grommet that I used.