Piki the original part numbers were:-
87123-323-000B (Black)
87123-323-000KG (Gold)
These are from a very old Japanese parts book I aquired and the 323 means they were for a 500 Four.
I agree that for custom paint jobs any colour is OK and it is because of these stickers that i own No 36 as I bought some used sidepanels from the US when postage wasn't a killer and commented to the seller that they must be from a K0 due to the sticker and he sent me back the frame number At which point i negotiated a price for the frame as i was going to the states early the next year.