is intended for use with O.S. engines that have a 1/4" crank thread. This Part Is Used With The Following O.S. Engines 50 SX 46 VX 46 FX 46 LA 40 FX 40 LA FS-40 32 SX ...

3x7mm Push Rod O-rings, intended for use with the O.S. 91HZ F3C, and 91HZ-PS 3D Helicopter Engines, as well as the O.S. FS-110-a, FS-120S-E, FS-120 III, FS-200S-P and FS-200S four stroke airplane ...