Another thing to take into consideration when replacing the bushings, is to order replacement hardware, 4 bolts, 4 nuts just in case. Odds are if you've never done this before, the subframe bracket bolts are rusted, and a pain in the ass to remove. Definitley have some liquid wrench available. Second the nuts, are spot welded (poorly) to the inside of the subframe, and most of the time, come loose with a lot of torque, so you are gonna need to hold a wrench on one side, and turn the head. That being said, have brand new nuts to replace the cracked subframe ones makes putting it back together 10x easier, plus I assure you, this wont be the last time you, either replace or lubricate the bushings.
Bolts and nuts are approximatley 2 bucks each, need 4 bolts, and most likely a few nuts. You can probably find a suitable supp at a napa or pep boys etc, I just prefer using factory hardware on stressed component.