For the most part, you are going to have to collect the parts you need as you can find them. Sean has some of the parts you'll need in this group buy -
http://www.xoutpost.com/showthread.php?t=2067
But you'll also need the radio module, gps antenna, and wiring harnesses to make this all work. Note that you'll need to gut the interior of the vehicle in order to run the necessary harness. This is a complex project, but Joe Puma and King (Arvi) have both successfully proven that it can be done.
Good luck!!