Just bought a Billetflow 2.76 S/C pulley along with the idler kit. The belt length recommended says 75.1 or 75. I do not have a lower pulley setup, just the stock stuff besides idlers and S/C pulley. Do I need to get the 6-Rib belt of the 8-rib? Also where is the best place to buy a Gatorback Belt?? Thanks, Keith