Thanks for this thread! I've had one missing on my 05 since I bought it used 5 years ago. I never knew what it was called and couldn't find it on the parts fische. Now to decide to spend the big bucks or not. Seems I've lived with only 1 for 5 years and could never tell the difference between the right and left side of the bike.
Buy OEM Parts for Honda Motorcycle 2005 Cylinder Head Cover Diagram
Left is your left when sitting on it. (Sit facing forward.)