You've already likely discovered that the R1000XT is a special Radio Shack derivative of the Shure M95 that Shure marketed in the '90s as the M
E95ED. The Shure stylus is N
E95ED, aka NDC-ED, also Pfanstiehl index 774-DED-- but also -DEJ and -DHE, the latter with performance virtually identical to the M95HE if you can find the HE stylus, and finding that would be a pretty deep rabbit hole these days.
The S320? Seems it's another R1000XT/M
E95ED/EJ/HE, but with cosmetic differences that show it to be part of a house-brand family called Designer Series.
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