Nice.l thanks for the clarification. I was going through my hardware set for the bumper last night, and was puzzled at how the through bolt would go through my factory bumper hitch (threaded). So the correct thing to do here is to use x4 M12 bolts, and not the 4” long bolts (x2).I have the other hitch which mounted in the frame; it uses an adapter bolted in place to hold a receiver ball-mount. The hole pattern on your standard rear frame and the frame with the square hole are different, which is why the holes on the center piece and the bumpers pieces are slotted to accommodate both patterns. All four holes on my frame were threaded, so the installation of the center piece is different (no through bolts or use of the spacers). He covers that in the instructions.
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View attachment 2660969
I think this sums it all up. Every nut/bolt accounted for and looking fwd to throwing it on