Might want to use a steel strap setup.

Don't recall what the fins on the diff look like... but my gut feeling tells me there's not enough material there to bolt something to that's expected to be bashed against rocks.

I'm trying to remember a similar steel strap setup I've seen..... basically only one side would have a bolt and that's used to tighten it down.... I can visualize it, just can't remember the application...