Side brackets/arms for Iloknzi teleprompter

I purchased an Iloknzi teleprompter and was disappointed it didn't have any hot/cold shoe mounts for a light, microphone, etc. The booklet for it shows side brackets on the equipment list but they're not included nor are they available. I figured out where they would mount and designed a set. Because of the curved portion of the opening there is one for the left side and one for the right side. It's a decently snug fit since there's no good way I could determine to secure them.

I have the i2/12-inch version of the teleprompter but these may fit different models if they use the same base structure.