One other quick thought - If you really want to be able to change the camber angle easily and can weld, BMI Karts does sell the 3 hole shock mount. They are good people for Yerf dog parts, but thier shipping is a bit high for single items. They also sell lots on ebay.
Heres a link:
http://www.*************/item/Shock-M...ts-010012-5940
here's what it looks like on the a arm
http://www.*************/item/Right-A...-Go-Karts-5380