Almost tany Yamaha parts distributor online can help you! I'd went ahead and looked it up for you, it looks to be $266 and is listed as part number '5' on this list (part number 2YG-85540-M0-00). Check it out and if you have a local Yamaha dealer, you can just take them that part number!
http://www.yamahapartshouse.com/oemparts/a/yam/500437ecf8700209bc78c6ea/electrical-1
Kyle