All the coils are the same, from 1951 till about 1974. So any coil from the OMC twins in those years will fit on your motor. 1950 and earlier has the older style ignition system. You got lucky there
Vice Admiral Zephyr
1941 Johnson HD-20 (in restoration)
1947 Sea King 5hp
1948 Evinrude Sportsman
1949 Martin "40"
1954 Evinrude Fleetwin
1955 Evinrude Fleetwin
1955 Johnson JW-11
1955 Johnson CD-12 (3)
1955 Johnson QD-16
1957 Jhnson CD-14
1957 Evinrude Big Twin
1958 Evinrude Fisherman
1958 Johnson FDE-12
1958 Evinrude Lark
1959 Johnson RDSL-21B
1965 Evinrude Yactwin
1974 Tanaka 1hp (screamin' drink mixer )