We tried using the other holes that were drilled and we tried using the adapter plates from AC that raise the stock bumper for a 2" BL, but even with the bumper all the way flush with the fenders and grill, it still wasn't high enough to slot the bolts in. I'd say the bumper could stand to go up another inch and a half from where it is now, but I think that would require a bit more time and a few more hands than we had to hold the bumper in place while everything was measured out and marked.
I will say that I'm impressed that I could still lift by myself (barely) a bumper that is obviously much heavier duty than the original (though obviously not as tough as a Shrock or a Hefty), but there were a couple of things I thought ARB skimped on in the design. The shackle points, especially. Still, a place to mount a winch, and a bit more clearance without adding a ton of weight, and it looks good too.