Atomic 4 Delco Spark Plug Wire Set | MMDW 306250 7mm ignition wire set fits Universal Atomic Four marine engines with Delco distributors. Atomic 4 spark plug wire set For Atomic 4 engines from 1969 and up with Delco ignitions 7mm RFI suppression black ignition wires 90 dregree boots on both ends Includes coil wire Replaces Universal 295149