That is the replicast bellypan used for the SDR Battle 2008 series.
You can buy them direct from Replicast - and they do fit - I know coz I fitted one, but you need to make a cut out for the side stand - as the race bikes have the side stand removed.
Here's my post & pics - scroll down to find it
http://www.superduke.net/forum/viewtopi ... t=bellypan PS: Price seems to have gone up quite a bit...