These are available but the plug wire connection
is in different location than the Bendix coil so it
would be difficult to make them work.
There are many other reasons to loose spark
so check everything to be sure it is the coils.
This motor had lost spark on one cylinder but it
wasn’t the coil. If in fact the coils still do produce
a spark seal the cracks with liquid tape. I think
these coils are not going to be available any longer
so it may be worth your while to see if you can
save the ones you have. I have a cracked one I
sealed up and it is still working.
Link-
https://www.ebay.com/itm/Andover-Coils- … 1438.l2649
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.