Been there, snapped a bracket on my 4Runner doing the same thing. Hit up the local junkyard, they usually have a few old Cruisers picked clean. Online part-outs on the forums are way cheaper than the dealer too.
Man that's the worst kind of discovery after all that work. I've fought with those old bolts before and it just drains you. Joel's right about junkyards, they're your best bet for something like a bracket. The forums are solid too, people are always parting out rigs. Just make sure you get one from the same year and axle side.