I do not know what the ARB mounts look like (guess I should have really looked over the dimensions or at least inner photos to see frame work) but I mounted by sandwiching the unibody rail through the center with a 2.5x3 square bar and a 1/4 bottom plate using grade 8 bolts. Started with cardboard ideas.
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Then made the mounting brackets from bumper to new" frame rails" (now sticking out of unibody frame holes) using 3/16 diamond plate. Connected The square tube rails with 1 1/4 round tubing. Added two gussets on outer edges made from 3/16 steel plate for inner support. Outer shell is all made with 3/16 sheet metal. Gonna use 3/8 Amber led clearance lights as turn signals.
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I'm sure the shell is as thick as it needs to be if not a bit thicker. Weighs almost 100lbs with shackles and led bar. Debating doing a bull bar and what shape it would be.
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Finished my shackle mounts earlier and got the bumper ready for paint and lights tomorrow.
Can also take more pictures of inside woods, gussets and better mount photos. Should I tack wild it to the unibody for added rigidity or is it not necessary with the 4 grade 8 bolts I'm using?
Should I put some 1.5-2.5" holes in the lower front edge by radiator?
Will be doing holes in the skid plate in that area. Post photos of that tomorrow too