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Don't know for sure as I've never been lucky enough to have a set but I thought almost all aftermarket wheels had the tapered seat? I would have thought your standard subaru nuts would be fine.
pretty much every wheel requires a 60deg taper nut..........
+1
Millenniums aren't as deep a seat as a Rota wheel, which the OEM nut can grind at the finish. Millenniums use a post production seat which is press fitted and is more like an OEM wheel as far as depth is concerned