It's been over 2 years, but my wife brought the car home with the passenger side mirror literally hanging from the door, held on only by the wire and part of the bracket. I disassembled the housing, following the manual instructions, and was able to use a piece of aluminum (shaped with a file), some pop rivets and JB Weld, to repair the spring bracket. It can be done. However, complete mirror assemblies are always popping up on EBay for reasonable prices. Try and find one that has cosmetic damage for cheap and use the parts you need.

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1986 560SL
2002 Toyota Camry
1993 Lexus