Yea, it does suck but it would have sucked more if I had spent an hour heating up the gear in my oven so it'd fit over the carrier and then discovered the bolts wouldn't go through. I can deal with minor issues like that as long as I know about them first.
On this model ARB RD114, there are two countersunk screws on the mounting face of the ring gear that hold the two carrier halves together. I was able to loosen those two screws and rotate the carrier halves a small amount to get a couple holes to line up better before tightening the screws back up. I had to drill the rest out like the picture.