Wesco Kickmaster Holder Repair at the inner ring could be easier and less expensive with the presented part.

The OpenSCAD file is included, however do not change the parameters, because it fits.

The exchange of the whole ring is shown at:
https://www.youtube.com/watch?v=186PNAg2l4E

To repair the holder only you need two additional mounting holes in the ring as shown in the picture.