You will need: front spindles from an 04-05; calipers from an 04-06 (04 calipers are different than 05-06 but bolt in the same place); brake pads; rotors; front reg cab coil springs if you ant thehandling upgrde to go with the new alignment specs; Dana 60 from a quad cab (unless you ant to drop the ass, the quad cab SRT's mount spring on top of axle, the reg cab SRT's mount spring under axle like a car, as they are pre-lowered from the factory); custom driveshaft since the SRT axles actually have pinion yokes instead of flanges and are a different length. Once you do the fronts, you are tied to a 20" rim or bigger from then on.
Alright, first thing is you will have convert to SRT spindles as regular 1500 spindles have a different spacing for the calipers to bolt to. The rear isn't as important if you don't want to change gears, get a custom driveshaft or have bigger brakes out back. Keep in mind with the bigger calipers up front and the stock size out back your braking bias will be off.