Wheel caps - a Q?

[Dave C]

Tom wrote...
"You could always stick those self-adhesive wheel centres
over them. Dealerships here install non-OE wheels and fit the centres with
four rings-branded centres, every dealership has some in stock. All you
need to know is the diameter."

I wonder if these have an Audi p/n.
Maybe these are custom made.
Does anyone know if U.S. dealerships would have these?

Dave C.