Are are various 3D parts for the Knife Vertical Arm Box Race frame. You will find FPV fixed mounts in 45,50,55. 60 degree and a generic FPV mounts, TBS Stubby Mount, Axii Micro Mount. Mid Plate Spacers. You can have your 3D printer of choice print these parts.
If you have any questions, hit me up on FaceBook Speed Belmont.