Bumper brackets would be the difference between a 97 kit and a 98+ kit.
Here's the instructions for a 01-05 kit...all parts should be the same as a 98-00 and a 06+....people use the 05 kit for 06+'s.
12 blocks minimum(kit comes with 14
12 body bolts minimum(kit comes with 14)
Upper rad drops
Lower rad drops
Front Bumper brackets
Rear bumper brackest
A "C" lookin' clamp that keeps the a/c hoses or rad hoses from hitting the serp belt or fan
E-brake braket(doesn't need to be used)
2 engine ground strap drops(likely don't need used)
1 90* bracket for frame ground ext(likely won't need used)
Main Fuel filler extention(two different sizes included in the kit)
Breather fuel extention
Shifter extention if manual trans.
Kit comes with Trans oil cooler brackets if automatic trans w/ external cooler.
There might be more, but i think i covered it.