After calling & emailing every parts source (both new and used) around the world with zero luck, I finally came across a post from years ago that Ferrari of Quebec had a used one for sale. I got in contact with them and, although the part noted was long gone, Andrew (Parts Manager) was able to perform some magic and find one somewhere. A few weeks and about $296 later, and I had one in hand. Installed it and it fixed my speedo problem. After literally many dozens of hours on the internet and phone, I'm convinced it was the only new one available on the earth.
I kept the old one just in case they get even more rare in the future and are able to be rebuilt. Ya never know...
Anyway - Ferrari of Quebec is my new favorite place for parts! They'll be getting all my business from now on!