This photo shows the Concept One alternator installation kit. Made from 6061 billet aluminum, the brackets are 11/42-inch thick. The machined alternator fan is a must-use item to complete the look of the installed kit. The tensioner and alternator kits combined cost $475 for the machined finish and $625 for polished. Prices vary according to how many accessories are in your car's system. ours is as simple as it gets using water pump and alternator only.