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I was installing my polaris skid plate and after drilling out the factory rivets pulled off the side panel to retrieve the old rivets in the nose pan and found a rectangular rubber piece just under the y-pipe. Upon further inspection found another one in the bulkhead just in front of the airbox. I was wondering if anyone had and ideas of where they might have come from? It looks like they had some sort of adhesive on them and are about 1/8" thick. Any info is appreciated.