There is a complete lower unit available at the North Carolina location of the Brazilian Connection – unfortunately, they are not open until October. But if you can wait, here’s the link:
https://thebrazilianconnection.com/58j18southparts.html
Scroll down to the bottom of that page to find the lower unit.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
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."