[Ace in the hole]

I am looking at a skyjacker lift kit and it comes with urethane bushings. Heard lots of people don't care for them because they end up squeaking. So are a lot of you guys staying with the supplied urethane or substituting original rubber bushings? Where is the best place to buy original rubber bushings?

Also, is it worth replacing the transmission adapter and transfer case rubber mounts? I am not looking to do any serious wheelin but will have my truck off road.