I haven't got the cables yet so don't know what the diameter of the plastic gizmos are (most likely acquire from Burtons). I would like to follow the idea used by many builds and MK IIRC, which uses two bushes located in tube O3 for simple penetration and cable support at the rear bulkhead inside the tunnel. Can anyone advise what the inside diameter of the bushes should be to accommodate the Sierra Disc brake cable.