There's really nothing to changing the wires and connectors. I bought the set from the dealer and it included 3 wires and 2 connectors if I remember correctly. I think the M104 has two coil packs. I also used Bosch plugs that the dealer sold me. My car was a '94 E320 which I sold and bought a '99 S420. The wires/connectors on my car were in terrible shape though.