VMN has available replacement ball joints for the aftermarket upper control arms it sells. We also offer extended ball joints. The purpose of extended ball joints is to move the factory upper control arm higher so there is less chance of the factory control arm from contacting the spring on a full drop.
Whilst extended ball joints were once a popular modification, by and large they have been replaced by complete replacement upper control arms which offer significant other advantages in addition to sprint clearance. You can view the upper control arms VMN sells by following this link.