Celtic Lady, thanks very much for the follow-up.
For any who would like to know...
I struck-out at RigRite. Their heavy-duty bases look very attractive but those are only available with 0 degrees and 6 degrees angles. It turns out that the original T37 bases are 3 to 4 degrees. When I called this week, RigRite was sold out of the SD 36-HD2's with no known date for re-stocking.
I contacted my friendly/favourite stainless fabricator, Doug at Klacko Marine, and he estimates that he can custom build 4 new bases for about 50% of the price that I would pay for parts and shipping from the U.S. I have placed my order with Doug.
I have no interest in Klacko other than being a satisfied customer. Their website is here:
http://www.klackomarine.com/Eriks