I Have tried those codes , but paint suppliers dont seem to recognise them. I know a few P B coloured cars have been restored since i first posted , hoped they can help ?
Opel Scott resprayed his HB peacock blue a few years ago, he may be able to help, altenatively, unbolt one of the radiator support panels ( assuming its an ohv engine ) & get some paint matched up to it at a paint suppliers
I got mine from Jawel Paints in the Midlands, they advertise on eBay and mixed Extra Dark Wine from the 6RD code. Another paint supplier did the same thing and got it wrong, luckily a mate of mine has been in business for years and loaned them a paint chip to get it right.