On an '04 you will also need adjustable cam bolts for the axle end of the lower control arms. Your '04 has no means of adjusting caster and it's best to max out the cam bolts once the spacer lift is installed to remove driveline vibrations and correct caster.
It's also a good idea to find an additional pair of front coil isolators or 1/2" coil spacers if the jeep sits too low in the front from the factory.