I don't think there is too many around..then again maybe there is....Thanks for inquiring....
The SWSII OX66 are fairly common. Not as fuel efficient as an HPDI, but great motor that are pretty much bullet proof (which is probably why they wanted it). I believe they were 150-250 HP models. That one looks like a 200's cowling.
I hate thieves! I would poop a brick if I came home and saw a naked transom on my boat!