If it's like my Ltf-500F, all I can say is good luck. There are'nt alot of aftermarket parts for our machines. Quick note, If you do decide to make some homemade flaps keep your tire overhang in mind. Mine failed badly due to the tire actually going past the fender. You'll need to make up some brackets to keep the flaps from being drug on to the top of the rear tires.
If you just want too replace the stockers, they are available but expensive as hell.