There is a rear camber kit being developed by a company in Brisbane which is not too far off being available.
I would be very cautious of purchasing a kit from the states which has fabricated arms to adjust rear camber. There is a compliance issue with this type of modification, and it doesn't surprise me that there is reports of some of these breaking. Front camber doesn't seem to be much of a problem when lowering Euro's.
My advice, wait for the locally available rear camber kit, which will comply with ADR's and from all indications should be cheaper.