I just replaced my body bushings with the Energy Suspension poly kit. I had the same problem as you with both #6's and the pass side #7. You have to cut holes in the trunk floor to do these. You are going to need a cut-off wheel, torches, and a welder. Its a real easy job with these tools. It would be next to impossible w/o them. If you dont have access to these I would recommend taking your car to a body shop to have them installed. If you do have access to these tools, let me know and ill tell ya how to do it the easy way. BTW I dont think that you are going to be able to lift the body high enough to do the other mounts with out those being loose. And you are going to want to do those, they were the worst bushings that I took out. My car actually sits noticably higher in the rear with the new bushings installed.
James