I found a modified tailwheel steering arm and replaced the Van's arm.
I cut an angle to 1/2" width and drilled it to the angle support around the mapbox in order to attach an Adel clamp. This clamp stabilizes the wires for the light dimmer.
I stopped at Ohio Industrial Supply and ordered 300 cap screws for the interior and behind the instrument panel locations.
The ELT wire to the antenna will be stabilized with an Adel clamp attached to a screw attaching the baggage bulkhead.