Ultimately decided to just go with plastic covers from
Color Lugs. $20 for a set of 20, as opposed to $100 for a set of OEM lug nuts then about $100 to get them powder coated. Seems worth a try. I note that the Color Lugs web site thinks that the OEM nuts on the 370Z Sport wheels are 17mm. They're not...they're 21mm and require the lugcaps, not the boltcaps.
