uhm, not 100% familiar with US terminology I see: What is a 'rear A-arm"?
If it's somewhere in the rear suspension, I think I have plenty of pics for you. I did my full rear axle rebuild with just a big vice, nuts, botls washer and some steel tube sections.
If you talk about the 4 rubber bushings in the (what I think is called trailing arm), then I used this method: a threaded rod , a piece of tube to prevent it expanding, and a few adequately sized washers, some lube and a nut to pull the rubber in. (see pic)