FordPartsGiant.com offers the wholesale prices for genuine 2006 Mercury Monterey parts. Parts like Side Trim are shipped directly from authorized Ford dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.9L OHV EFI NA, 6 Cyl 4.2L OHV EFI. Transmission: 4AT AX4N.