I bought a black polly flap for a big truck and cut it down. its not as good at stopping the roost but im not too fussy about spending 80 when I can do it for 8 plus my time. just heat it up a bit and it bends nicely. if I could get my pic to load I would show ya... ohh well.
We put a Custom PDP flap on my wifes sled. If you go that route I suggest putting on a strap so it doesnt get sucked into the track. They sell strap kits as well.