Benny I got mine as a complete set. I have seen them for sale from the after market body pieces companies. I would hesitate to order them because there has been quite a bit of difference in fins from one maker to the next. Maybe you could take out the oppisite side fin and make a reverse of it. The originals were just simple wood. Mine are some kind of composite material.
Rudy

HI:
Do you know where i can get one of the rear break vent fins? I snapped mine? Waxing...