3D printed adapter to mount skyBeacon ADS-B to wing tip of older Cessna 150 that has a 2-hole Nav light mount. It fits my 1965 Cessna 150E. It uses heat-set #6-32 inserts to attach the skyBeacon to the adapter and the adapter to the wing tip. I made a sheet metal plate with a grommet to go inside the wing tip so that the wing tip is sandwiched between the metal plate and adapter to hold the adapter in place. You'll need to be careful of the length of the rear-most screw that holds the skyBeacon to the adapter so that it doesn't protrude through and hit your wing tip fairing.
I printed mine in white ABS and painted it with a coating of clear UV-blocking paint. I used a 5/8" ID grommet on the backing plate to protect the wires.