Most of those housings are an aluminum alloy. You can looking into getting the holes welded up then drill and retap them. Without being able to see it I'm not sure, this is only a suggestion but can you drill out the hole and use a nut and bolt throught the frame and housing?
Tip #2: To add some strength to your new threads it might be a good idea to add a little loctite to the threads of those bolts. In your situation I'd recommend using the "red" stuff, (stud & bearing mount) its stronger than the blue. If you do have to take it apart again it will come apart with a little heat from a propane torch. I'd also recommend & make sure you use a lock washer on those bolts as well. Happy Motoring!
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