This belt is a special application which is used with a single groove crank pulley (part number 132-1000) and a non-AC water pump pulley (part number 132-1002.) The belt is the exact size to fit around both of these pulleys with no alternator or idler pulley required. Great for race cars with no alternator, dyno setups, test stands, etc or any other setup with no accessories or bracketry on the front of the engine. These quality belts are made by a division of Goodyear, (even though they don't have the "Goodyear" logo printed on them.