I bought Energy Suspension Polyurethane Bushings at my local Autozone , They had them in 2 days with no shipping charge . They should be able to get stock type rubber also .
Part # 3.2122G for black or 3.2122R for red http://www.autozone.com/home.htm
You can also buy them at Suspension Restoration http://www.suspension.com/nova.htm
Just 2 places ,