I made a 3d model of the power supply harness bracket. I don't have an original so I had to make it based off a picture and the screw holes on my cabinet. I think I've got it pretty much perfect. The whole thing is 2mm thick to give it some rigidity. I used 4mm screws and nuts to hold the connector to the bracket. The original one is threaded.
Here's the STL. Dimensions in mm.
Here's the STL. Dimensions in mm.