just changed my mates oem front discs for him as he had one warp, and since he changed them for a set of vipers, he wants to sell the good one as he doesn't need it for a spare. its the front left side disc as you sit on the bike from a 2002 year bike, gold centre, no scoring with nearly 4.5mm thickness, the minimum says 3.5mm so quite a way to go.
after £25 or 25 euro plus postage.