bushing/sleeve

As part of the teardown of my Terra Trailtopper, I discovered there are two steel/rubber bushings inside of the trailing arm pivot with a 10MM rod holding the trailing arm to the bike. The bushings (there are two) are comprised of a 10MM ID steel sleeve and a 20MM OD rubber bushing. Has anyone...

Wondering if anyone has suggestion or part # (and supplier) for the copper sleeve/bushing on the rear diff casting? Complete overhaul of the rear end and the bushings are very loose. Any help appreciated.