My first thought is: How good could those shocks be by now if their bushings have gone all wonky?
That said, assuming you don't have a handy machine shop with a press, you could try drifting out the old bushings with a hammer and a suitably-sized impact drive socket (cause they're a bit harder and sturdier than a regular socket), toss the new bushings into the freezer to contract them a bit, fashion a little press out of a bolt, a couple of good thick washers and a nut, grab some gloves and a torch, heat the eye where the bushing is to go to expand it a bit, fetch a bushing from the freezer, put the bolt with a washer through one side of the eye, the new chilly bushing and the other washer on the other side, thread on the nut, and start tightening it down like you're trying to win a nut tightening contest. That might get 'em in there if they're not too tight of a press fit.
But again, I might just replace any pair of shocks that had rotten bushings on the theory that those are likely junk too. New shocks typically come with the bushings already in them.
While you're pulling off the shocks, it may be a fine opportunity to check the swing arm bushings for excessive play. Moving the swing arm side-to-side or rocking the rear wheel about should tell the tale.
Topic: Rear shocker rubbers. (Read 2672 times)