If that's the one in your picture you might consider having it rebuilt. There's many rebuilders around the country that are fairly competitive. If you want to just buy one, it won't of course be cheap. I saw one on ebay (used) for around $1500....but you might have to have a used one rebuilt too.
If you're mechanically inclined, you might be able to rebuild it yourself. Most all the parts are available and you can download manuals online at many sites.
Thanks, my 10-18-014 does not need to be rebuilt,, All I need to know what goes on the output shaft.
This 72C came with my V-drive boat as extra parts.
I was going to install it, but it seems I can not find anyone that would come up with the knowledge of what is missing.
I have it on Craigslist, cause I can't find the rear shaft housing or out put shaft housing, or what ever is missing.