I have installed the OMC coils on Phelon cores they work good but the wire routeing is tight. I don't see how you can beat the Amazon price for S3-604 coil.
Mercury -MK20, MK10, KH7, KG7,KG4, KE4,KE4, KE7, KF5,KF3,KE3,KD4
Wizard WH7, WD4
Johnson - QD15, HD26, TD20, KA38
Sea King 5, K1 (merc)
Evinrude- Foldlite 1930, ELTO - LW #309, 1951- 7.5, Zephyr, 68 3 hp
Bendix SMD , Champion 4.2 , Scott 7.5,