Cognito Pitman & Idler Arm Support Kit 11-13 GMC/Chevy 2500/3500 HD PISK3008 Pitman & Idler Arm Support kit - '11-'15 Chevy/GMC 2500HD/3500HD For use only on OEM center link in OEM position, or OEM replacement center link in OEM position. Not for use with lift kits that use a dropped center link. Cognito