8040 90 degree Interface Plate with rise.
I made these to mount a Fanatec pedal plate, can be used for many other things as well.

Accepts M8 bolts with space for a washer to slow down PLA creep.
Onshape link for custom sizes: https://cad.onshape.com/documents/08bcf276871637e81502f129/w/9f6a0a3436a94681d5902a22/e/bffd44505f44f24d7fde0126?renderMode=0&uiState=68ef3e882c4364444ead9779