Fits the "Free RC Airplane" available in Thingiverse.
Simple adapter for the Taildragger landing gear available here:
https://www.banggood.com/Aluminum-Alloy-Taildragger-Tricycle-Landing-Gear-wSteel-Ring-Tail-Wheel-for-RC-Glider-Airplane-p-973300.html?rmmds=myorder&ID=516401&cur_warehouse=CN&p=B701157141617201611A&custlinkid=860631