I finally found the custom order link from Toyota (I never noticed it was at the end of the "build my own" which initially is just a "find this car in existing inventory".) Anyway, there's a 20" wheel option right from Toyota via the configurator! I'd much rather just get them up front vs. buying aftermarket (and having to sell the stockers). They're great looking wheels too (not sure what tires come in the package) - they're listed as manufactured by Enkei: