james duff has a set you can buy, you can get them at autozone or advance auto parts also for $60 i think. you just gotta losen up the body mount bolts, us a jack and wood under the body to take the weight off the mounts and slip the new ones in place. in the tech library look at the write up on installing a body lift, read the section where he talks about replacing his bushings and placing the pucks in place, youll do the same just without placing the lift in place since your not doing that.
just a heads up, if you do it yourself, spray the bolts with pblaster everyday for a week or so ahead of time, youll be glad you did.