First off i have a 2002 buick regal ls. I installed a new 220 amp alternator. It came with an overdrive pulley but i had to use the stock pulley because i thought the other pulley was too small and the belt would slip. I really want to use the overdrive pulley for more output but i need to know what size belt to use or if the smaller pulley will fit. The pulley size is about an inch difference. 6 groove. Also i cant find any tensioners so i think the 3800 series 2 uses the alt as a tensioner. PLEASE HELP!!!!!!