You can have it re-made from polyurethane by Rodney's Machine Shop, Garth Road, closer to Williamsville side.
Rodney - 366-3489
You need to be mindful of the design of the bushing. Some bushings need to flex, like the 2000 Mazda 323 below. You will not be able to use solid stiff bushings (brass/teflon)with this design.
This one, from a 2003 US spec Sentra, does not need to flex as the pivot points are on the same axis.
Teflon bushings (available at many machine shops, Apex in Gasparillo comes to mind) have a very harsh ride. You will also need to change your cradle arms instead of changing bushings, so know what you are possibly getting into wrt maintenance.