Buc – don’t know if this helps you or not but I was chasing a lead on an SD-15 a few months ago but it got away from me. Anticipating I might have been able to buy it I prepared this list of common parts with their part numbers. Happy to share.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20
“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."