I thought I saw some arms on Rock Auto.
The arms are aluminum, just like the Lincoln LS steering knuckles.
They were not intended to be rebuilt, but replaced as a whole unit.
It takes ALOT of heat to expand the aluminum to get the old ball joints out, and alot of heat to get them back in.
IME... It's a two person job, and the control arms should be removed from the car.
Caveat... most shops will probably not want to do the job, for liability reasons.