Baueda have added 15mm Japanese field palisade terrain pieces to their online store.
From their website:
Japanese field palisades this time, these were used to create fortified lines behind which arquebusiers can shoot while remaining outside the reach of cavalry, as in Nagashino (1575). These models are very detailed and accurate reproductions, based on period illustrations. The palisade itself is cast in our usual very high quality lead free alloy while the bases are realized in tough polyurethane resin for maximum strength and detail. More Fortifications are always in development, keep an eye on the Hoppidus range main page for an up-to-date snapshot of new models on the way.