Rear upper control arm bushings/bolts

[elvis240sx]

car is a 90 240sx hb. i was going to do an alignment on the car the other day at school, but when i went to adjust the camber in my rear i had trouble. the drivers side cam bolt would spin very little, but then twist back almost immediatly. the bushing in the upper control arm appears to be seized up, and causing the bolt to not spin at all. i need to get new bushings for that arm and i guess new cam bolts to put in too. does anyone know where i can get these or is it dealer only? anyone know prices or close to them? any help is appreciated. thanks

[elvis240sx]

ok, i found some new bushings that also correct for excessive rear camber, which i need to do. http://www.pdm-racing.com/prod....html has them, about 1/3 of the way down, the rear camber correction bushings. has anyone used these? do i need a special bolt to hold them in, or will any bolt be able to grip them to twist them around and adjust the camber.