Compatible with 1999-2007 Chevy Silverado 1500/2500/3500HD(Only fit 2007 old body style models / Do not fit Dually & Step-side models);
Compatible with GMC 1999-2006 Sierra 1500/2500/3500HD models only (Do not fit Dually & Step-side models);
Compatible with 2007 GMC Sierra 1500/2500/3500 Classic models only(Fit Fleetside 78.0" / 96.0" bed length models only).