Front FE2 bar:
Endlinks 25679063 (order 2 or go with energy suspension)
Center frame mount brackets 14086860 you need TWO, and yours won't work
Center frame mount bushings 14086877 you need TWO, and yours won't work
Front FE2 springs:
Listed as 22076866 ONLY, but says 'order by application'. This is because FE2 has about 5 different close diameters and you need a matched set.
Rear FE2 bar:
255559836, and you know the drill for the endlinks (generic kit from energy suspension)
the inner links are also listed as 'order by application'. I'm not sure why, as there should be two distinct sizes.
Listed again as 'order by application'. The RPO code for "Computer Selected Suspension" means that your springs were computer matched by load rating and spring rate as a matched set of 4 for the best ride and performance.
I suggest you email GMPD about this.