Cessna 336/337 Fiberglass Vertical Fin Tip Lower. Replaces: Cessna Part # 1431001-4/-6/-11. Cessna 336 s/n 336-0001 & up, 337 s/n 337-0001 & up, F337 s/n F33700001 & up, T337 & P337 s/n P3370001 & up, FT337 s/n FP3370001 & up.