MoparPartsGiant.com offers the wholesale prices for genuine 2015 Ram ProMaster 2500 parts. Parts like Vacuum Pump Vacuum Harness are shipped directly from authorized Mopar dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 3.0L Diesel, 6 Cyl 3.6L. Transmission: 6-Speed Automatic Transmission.