Part number BHCBA-MCS-G00P for an aftermarket 1300A4 ABS air filter and they're the same on all years. If you order just tell them you have a 2004 model as anything newer they can't supply.
David silver is only to sell parts for bikes 10 yrs or older. thats why you tell them you have a 2003/4 bike
Thanks CrewVery helpful as usual. Looks like a couple of weeks longer until I change the filter - will save for K&N