I designed these to fit my headboard, which has a 75 mm diameter. I’ve included the STEP files in case you need to modify the size.

I used the bolts that came with the light to mount it to the 3D-printed part, and then used M5 × 20 mm socket head bolts to join the printed parts together.

I printed mine in ASA. They’ve been on my ute for 4 weeks now and haven’t moved—which is pretty surprising considering I drive on rough dirt roads every day.