I know this is an old thread. BUT for any future readers, a cam kit can be picked up online for $20 or so. Buy the round ones not the funky shaped ones, and YES they are necessary for proper alignment if you have cranked your torsion bars and possibly if you changed tire size.
And you can buy upper ball joints, generally speaking if you can buy it is replaceable without changing the entire arm.

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Also I would like to say NEVER EVER trust a big O tire store, especially a franchise one, they are notorious for lieing to people to get them to pay for parts they do not need.