I was told by one of the vendors that the only place making steering worm gears is a company in Argentina. They are still making them but, cannot export them to the US. He said the US and Argentina are not playing in the same sand box well, and this is the result.
I contacted the argentine company CHS - Ricardo Cavallero SRL and they can export without problems to the US.
For 30 years they worked with MAC's Antique Auto Parts until Eckler Industries bought MAC's and they continued working with Eckler´s until they closed in 2020.
Currently Ricardo Cavallero SRL does not have a distributor for the Ford A and Ford Early V8 product lines, and for this reason their products are not in the US market.