BMW 6cyl (2006+) Drive Belt Tensioner + Bolt (KIT) Drive Belt Tensioner & Pulley with Bolt. For Alternator, A/C, Power Steering Belt. BMW part# 11 28 7 530 314, PLUS # 11 28 7 530 315, critical bolt you MUST replace too. Please see FITMENT CHART below, under PRODUCT DESCRIPTION.