From some reasearch this is what I found.
For 99-00 there was a STD S (NOR on the Parts list), Sport S, and Hard S

STD S had the 14" wheels

SPORT S gave you the 15" rims (same springs and shocks as STD-S)

HARD S was the Sport Suspension Option, Bilestin shocks, Sport springs, 12mm rear bar and STB.

01-02
STD-S 15" rims

SPORT-S 16" rims, bigger brakes, additional chassis bracing, STB. IIRC the springs are the same as STD but the front shock is different.

HARD-S all SPORT-S plus the Bilstein shocks, Sport springs and 12mm rear bar.

(My 01-02 parts list is at home, I will verify the shock thing)

03-04
I havent look into these yet but suspect that it is the same as the 01-02 SPORT-S and HARD-S(except MSM)