From the box on my shelf. I try to buy them from Chicago BMW 6 at a time. With their slow delivery I may run close, but not out......
Here's a site that will help. CLICK HERE to enter, then enter the last 7 digits of your VIN:
http://www.realoem.com/bmw/
BMW doesn't make changes just on their year model releases. They also make changes/corrections/modifications etc. during the entire production run. Your VIN shows what exact parts were used to make your bike, or something along those lines.