LS Accessory Drive Bracket Installation Kit for Middle Alignment Installation Kit, LS Acc Drive Brackets, Use with Middle Belt Alignment (alignment Common on F-Body & GTO) HolleyInstallation Kit, Ls Acc. Drive Brackets, use with Middle belt alignment (alignment common on F body & Gto) Holley accessory drive installation kits provide proper spacing for Holley A C, P S & Alt accessory drive brackets, so belts ride at the perfect distance on your particular engine. A Fitment And Required Components Guide helps you locate and source components and provides other notes and helpful hints to figure your distance. Three easy steps