Pierburg Vacuum Pump # 7.28237.05.0 - Saab OE #: 55 561 099 100% NEW Pierburg Vacuum Pump. Pierburg #: 7.28237.05.0 Saab OE #: 55 561 099 Also Replaces Pierburg # 7.28237.04.0 and Saab #: 12 787 696