This shows two different chain guards. How do I know which one to order? part is #2
http://www.bikebandit.com/houseofmot...m2057sch409120

Also, the site I want to buy from has two different 600rr's. One is a 600rr A and the other is a 600rr AC. Anyone know what that means?

 

I really am not sure but the ac might be the california edition?? Id try pasting the sku number in a search and see what comes up for both.

 

C is for the California model, and the first number supercedes to the second number. 40510-MEE-010 is the one you should order. They're both the same part, Honda just changed the part number. They do that...a lot.