MoparPartsGiant.com offers the wholesale prices for genuine 2018 Chrysler 300 parts. Parts like Mounting Covers And Shields are shipped directly from authorized Mopar dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.6L, 8 Cyl 5.7L. Transmission: 8-Speed Automatic Transmission.