This is a 90 degree mount for a generic E-Stop button. There is a removable mounting panel to make wiring easier. The housing has two variants for attaching the mounting panel: heat set inserts or just screwing directly in the plastic, those holes are 2.5mm in diameter which is the drill size for an M3-0.5 tap. Finally I added a printable drilling/cutting template for the mounting holes. Step files are included if you want to modify anything.

Note that the E-stop_Mounting_Plate has one off center through hole, when assembling this hole needs to face the three holed mounting surface of the E-Stop_housing (see last screenshot). The bolts will line up anyway you want but the outer profile will not.

Recommended E-stop button for AC applications: https://amazn.so/o5zJTRo (Any E-stop button will work as long as it is designed for a ~22m through hole).

Required hardware: 4x M3x16mm socket head cap screws 3x M4x12mm socket head cap screws (longer will be fine, just depends on what you are mounting this to)

Optional hardware: 4x M3 heat inserts (smaller size) https://amazn.so/4QlCX3c I buy the size I need in bulk from McMaster but these look like the right size for my design.