That's a 550K0/1 type tank: Honda's petcock includes a fuel filter that fits up in the hole. It is:
16950-374-671
Honda says they don't make it anymore, but you can try eBay, David Silver Spares, Common Motor, or even places like PartsNmore.com, there's a lot of those out there, still.
There's also the petcock by itself:
16951-374-671
and the fuel screen by it's self, which is still a current Honda part:
16952-341-671