Super Damper1998-2002 GM F-Body LS12004-2006 Pontiac GTO LS1/LS2Aluminum Shell/Steel Hub5.67" OD (25% Underdrive)External Balance6-Rib Notes:Requires and includes 1.250 in. longer crank bolt with washerRequires shorter belts -recommended Gates 6-rib 465-K060760, 8-rib 4040390