I picked up a PFB203 junction box to try and come up with a solution for mounting it to the fence that wasn't the PFA124. I wanted to have better use of the rotation in the arm to get it pointed where I wanted it. I have made some revisions to the spacer and sent the file over to my neighbor. Hopefully he is able to print another in the morning. It's PLA for now, but will be ABS or PETG one I get it finalized.
The new revision includes locator holes that align with the tapped holes already in the junction box. If anyone else requires one of these, they can more easily use the spacer as a template for marking the holes that need to be drilled and tapped for the 4 bolt, bolt pattern on this camera.