I'm in Tokyo right now on business. I went to a shelter dealer here. He claims he can not sell me a 90x. He has several 901's in stock. I have to admit, our language skills are not the best. But, I think your argument about the 90x being a US model might be correct..given my interaction with this person...do not take this as fact, but something to further your argument.
Shelter 90x vs 901 / Graham arm
I am hearing that the 90x is simply a more expensive 901 made for the US market. Anyone compare the two directly? Also, anyone have experiences with Shelters on the Graham tonearm (I have 1.5T with ceramic arm wand and new bearing cap). Also, anyone compare ZYX 1000 to shelters. Your input would be greatly appreciated.