20mm wheel spacers, 7/16 thread: help me find?

[brrian]

I'm having no luck finding 20mm (or 3/4") hub-centric wheel spacers, 4.75" bolt pattern both ways, with 7/16 threads. I can find 12x1.5mm threads, or can find 7/16" in a 1" spacer, which is a bit too thick. Anybody know of a place I can get this exact combination?

If I can't find this I'll go with 12x1.5mm threads but for OCD reasons I guess, I'd like to keep everything 7/16".

Thanks...