Kawasaki OEM Brute Force - Rear Rack Extension -Wrinkle Black by Kawasaki. OEM BF650-004B Genuine OEM Kawasaki Part OEM Kawasaki OEM Brute Force - Rear Rack Extension -Wrinkle Black by Kawasaki. OEM BF650-004B Part Number: BF650-004B Quantity: 1 May not include original package.