You also need the o-ring for where the little metal coolant pipe connects to the pump and probably the o-ring for the thermostat. Also you will need the threaded rod for the tensioner. Might as well replace the radiator hoses since they will be off.
Sears sell a 1/4" 13mm swivel socket for $7.50 you can use instead of the Snap-On tool.
There should be plenty of DYI info on this on this site. You can start with this:
http://www.peachparts.com/shopforum/showthread.php?t=114266