Personally if I were going that route I would use aftermarket lugs (acorn style, black or chrome for $50) and an aftermarket center cap. I may go that route for my snow set up (still need two more 19 inch wheels and two more TPMS).
Not sure what size cap fits, it is around 63mm OD.
I am one of those people but this is kind of an atypical accessory. It seems to be the only accessory I can't simply order on the store but have to specially call a service center to get?
Also it just seems to be pretty overpriced. I would rather have the Lucid branded pieces but these don't seem like something I should have to spend that much extra on. They are plastic, correct? Should've just included them with the vehicle...