The most reasonably priced component used on the Gsxr1000 2012 (l2) Usa (e03) Headlamp is the Washer(8.5x18x1).
This schematic depicts all components used in the Gsxr1000 2012 (l2) Usa (e03) Headlamp partslist.
A sample from the products for the Headlamp include: Fastener,cowling, Headlamp Assy, Washer(8.5x18x1), Cover,socket.