Based on the item from here:

https://cults3d.com/en/3d-model/gadget/offset-bracket-for-aio-radiator-top-mounting-for-lian-li-o11d-mini

I've redesinged from scratch this little helper. There is no nuts for mounting needed - the screw hole is 2.5mm wide, wich is the core hole diameter of an M3 screw.

To avoid deformation over extended period of elevated temperature exposure:

Recommended Material : ASA/ABS or any of it's derivatives. Untested materials but potentially useable : PETG/Nylon/Polycarbonate

NOT Recommended : PLA or any of it's derivatives.