You can replace the LCA bushings without replacing the whole arm, but you'll need a press to get the old ones out and the new ones in. The arms don't wear out unless they've been bent. You can also buy arms with bushings already pressed in. I recommend Meyle HD bushings. I've tried replacement BMW, and power flex polyeurethanes, but they did not last as long or ride as nice as the HD's.

There's a harbor freight front end kit that has a separator that works on the Forward control arm ball joint. The balljoint stays in the steering knuckle. If it is loose, you'll need to replace it as well. However, it is very difficult to get out.