These were from Ebay.
They are actual Epace mirror covers from a Borasco Grey car sold by a Jaguar dealer after a customer upgraded to Black gloss.
I had bought them for £39 and had them Hydro dipped with Carbon Fibre for £60. So £99 all in. Jaguar Dealer wanted £595 for the same thing.
I have also seen Genuine Satin Chrome mirrors on ebay .