D0AF-9E718-C Distributor modulator control module for 1970 Mercury Cougar and Ford Mustang with the M code 351C-4V engines and FMX or automatic transmission. The 'black box', supposed to have a blue cover, The Autolite Shop Tips guide describes this box as having a blue cover and a stamped part number of D0AF-9E718-S. The Ford MPC shows a master part number of D0AZ-9E718-C, and a box marked D0AF-9E718-C.