Today wasn't terribly productive. I managed to install the new Borgeson steering box. Overall it looked pretty similar to my ancient AGR steering box, with the exception of having 4 mounting ears instead of 3. My frame only has 3 mounts, so the 4th is just, there...
I was able to reuse the fittings from the old box on the new box. The Borgeson box uses metric fittings with o-rings, which were the same size as my old AGR box.
The Borgeson box also uses a slightly smaller input shaft.
Andrew