ok, well if you have a ps2 controller you can use those.
go to this vid to take apart your xbox 360 controller http://www.youtube.com/watch?v=LCCsAaRkVCY
and this to take apart your ps2/ps3 controller http://www.youtube.com/watch?v=uFYrtYnqT8k
you will need a small screw driver for the ps2/3 controller and a torx t8 or t9 controller for your xbox 360 controller.
what you will do is take the joysticks once the top cover is off and pull them out of each. then put the ps2/3 joysticks on the xbox controller