I would take my car to my alignment/tire shop since most people there are 40-50-60 yrs old and have seen any situation many times before = these guys are pros and worth every penny.
You may not have such a luxury. See if you have a low-rider type specialization shop around or someone in the alignment business for many years (not the chain-type stores = you want experience).
I would also consider fabing the part out myself if possible = you may need to use hardened steel or even oversize regular steel.
http://www.drivewire.com/Performance...gnmentkit.html (old picture will not show, this the the camber adjuster)