These are the GM parts number for the rear sub-frame bushings. I guess you can re-use retainer and bolt, which saves me about $30.00.

10249731 Insulator, Upper....$38.93
10248771 Insulator, Lower.....$18.75
11611679 Insulator, Retainer...$10.80
10410940 Insulator, Bolt.........$5.94