Exactly what Burns said. Now that the V8/I6 options are becoming so much more popular, the SR support is not a massive market anymore. You can try your luck with MazWorx as they'll build you probably whatever you want but you'll pay a premium. Some of the companies you mentioned will also build them on request but do not advertise them. Plasmaman is another manufacturer that comes to mind as well.
Best of luck.
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