One wheel turns easy left and right/ other side not easy

Well I have the one upper SPC arm already and it fits great and is super easy to adjust just where you like it. It also is still rock solid tight and only 6 months newer then my rebuilt stock pos upper arm. I say pos cause it got new rubber bushings-that still look great and a new ball joint-moog. The other arm crack and rip the ball joint out a bit--yeah a little rust and wasn't made to last 35 years.

I found this link pretty cool

Caster, Camber, Toe

http://www.ozebiz.com.au/racetech/theory/align.html