I decided to share this model since I wasn't able to find anything online. It's for the newer / smaller alpha mini psu ( 75mm * 32.5mm )

Simagic Alpha mini PSU Bracket compatible with 8040 simrig ( Currently used on a GT Omega Prime Lite )

The tolerance is tight but it fits, you could increase the size to 103-105% if you have issues. It's made a little tick to have the bolts sitting flush.

I know it's far from perfect but it works and I might post a V2 soon if someone is interested!