All compatible oil filters for this car should have the same diameter, just speaking in general about normal oil filter service. The Purlator number for the 370Z is PL14612. The PL14610 is a slightly longer version that also works (longer is better, assuming you don't have issues fitting due to aftermarket stuff).
I'm not sure why Stillen would recommend PL10193, but I'd guess that the sandwich plate must have a wide-enough surface to support it? I guess in theory wider is also better, assuming it seals correctly.
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