You get to chose from 29 different shocks. To help you better understand Bilstein's Numbering System, here is an example "S" = Steel Body (grooved for snap ring).
NEW BILSTEIN 9" BIG BODY SHOCK,46mm,S9Z,GAS,RACING
NEW BILSTEIN 7" SMALL BODY SHOCK,36mm,S7G,GAS,RACING
Bilstein 7" Shaft Aluminum Body Shock 588/220 Valving
Nice Bilstein 7" Shaft Aluminum Body Shock 688/220 Valving & Schrader Valve
Bilstein 7" Shaft Small 36MM Body Racing Digressive Gas Charged Shock S7M3050 T5
NEW BILSTEIN 6" SMALL BODY SHOCK,36mm,S6G,GAS,RACING
