Not sure which Buckeye 3 axle truck bolster mount will work with your custom Z scale project? Try the sampler set. One set each of the 3 styles of bolster mounts for Z scale Buckeye 3 axle trucks without coupler mounts. Designed to work with Micro trains Z scale 33" Diameter standard wheels (#950), 36" Diameter standard wheels (#957) and round bolster pins (#952)