Found this while browsing the Bay. It says for 2012 model, but according to Renthals website (although it's a JT sprocket) they're the same part number. The Ad doesn't say if it's a 530 or 520 pitch though. See Honda CBR1000RR 2012 Front Sprocket - 1 less tooth | eBay
I spotted an RR4 track bike on there too for a grand plus the reserve. I was tempted to make him an offer to p/x my rear shock for his Ohlins