Std air filter size??

[Jono FD3]

Need to know what size the stock air filter is on the FD!!
I\'m running an ARC induction box (well I was) but now because of my monster V-Mount set up I need to make a custom induction kit & I need to know if my K&N panel filters from the ARC are going to be big enough as I\'m only looking at using one of them!!

Cheers
Jono