Depends, how much do you want to trim your fenders? With that much lift, I would go with 35's and some dished out rims for added stability. With that much lift, you shouldn't need to trim for 35's if you are running bump stops. If you want to go bigger than 35's, you will probably have to trim. As for the body mount brackets, are your current ones rusted out? As for the body mounts, didn't see any glancing around on e-bay so I can't really comment on them. All I can say is that you get what you pay for. I would try the stealership, some parts stores like carquest might also carry them.
hick