I'm not sure what your fastener looks like. The ebay items that fastboatster mentions are sold by Bolt Motorcycle Hardware and are widely available from motorcycle dealers. They're made of nylon. The original Suzuki fasteners are available from (surprise!) Suzuki. They're actually made by Nippon Industrial Fastener Company, aka Nifco, and are made of Delrin. You can sometimes find a tiny "NF" and their part number stamped on them. At one time their web site displayed information on them but they might have gotten pissed about my accessing it as the last time I looked, it was off limits.