These are Yamaha factory (GYTR) radiator braces for a 2012 Yamaha WR450F. I picked them up from Amazon in September 2013, and recently (December 2014) decided to install them. Better late than never.
This video shows how to install these braces, where one of the radiators is a little banged up and squished.
Amazon description: Yamaha 1DX-E24C0-V0-00 GYTR Radiator Brace for Yamaha WR450F
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