Try and do search on ebay for your year model. www.ebay.com
You can drill small holes on both sides and put plastic wire ties,and lace it up that way if it's not big of piece.Or,do a search for Suzuki web sites.
For torn or cracked fenders, I use a piece of light metal flashing about three inches wide and the length of the tear. Hold the metal strip under the tear, drill holes through plastic then through the metal. Then I use pop rivets through both holes. Complete one hole at a time because you will never get more than one hole lined up at a time. Use rivets that are just a little longer than what you think you need. The extra length of the rivet protrudes under the fender out of sight. Too short a rivet and you may have to redo a hole or two (or three or four). Paint the top of the rivet to match the fender color if the bare rivets look too country for you.