It's not exceptionally well known that the GX470 is a fancier version of the Toyota Prado 120 Series Land Cruiser. Most of the body, frame, drivetrain, etc. will interchange between the two.
Putting an ARB meant for the Prado on the front of the GX isn't unheard of. It requires some... trimming... to fit properly. What kind of trimming? Well, fender trimming. The ARB instructions aren't terribly difficult to follow and will suffice for the majority of the install.
There are two lines that must be bent. They are highlighted in yellow.
Another point the ARB directions leave out is the removal of this bracing. I've highlighted it in orange.
You'll want to remove the fender flares at this point. It is not difficult. Some plastic pry tools make it easier. Don't have any? A soft plastic spatula from the kitchen will suffice.
Now here is the biggest, most treacherous step of the process. Cutting your fenders! I recommend starting small and moving slowly from there.
The cut above was enough to fit my bumper. There are a few things beyond cutting I would strong recommend doing (see photo with arrows).
After several 'take a little off here, snip here' sessions the bumper should fit. ARB recommends giving 25MM clearance between the bumper and headlights/fenders. I set it at an inch (25.4MM) and went from there.
I spent a good portion of time tweaking the fitment and trimming small portions off the fenders until I felt positive it fit perfectly. Make sure you are 1000% happy with the fitment of the bumper and go through the 'pinning' process listed in the ARB instructions.
Trimming the fender flares is akin to trimming the fenders. I trimmed the smallest amount possible until the flare would fit snugly on the bumper. I spaced an outline 1/2" from the snug fit. I did this in smaller increments until the fender flares matched the bumper. A little at a time. For this process I used a jigsaw with a fine-tooth blade.
Whats next in the crazy GX build? Winch, I think!