ok if i missed this in a search i apologize
but what is the difference between an adjustable ball joint and adjustable anchor bolts for camber correction

i definetly need camber kits because when my car was up on the lift for the new exhaust installation the inside of each front tire is worn. I have thought about this before but never got around to doing it.

and was reading that the SPCs are pretty good quality so i was thinking about them for the fronts

i looked on this website
http://www.iapdirect.com/catalog_items.asp?vid=14

the rear looks easy
the 25 dollar ingalls bolt swap thing

the front has adjustable ball joints
spc part#67370
and adjustable anchor bolts spc part#87590

do I need both parts to adjust camber or if not which one would be better?

thanks