You need:
4x M3 brass thread inserts
4x M3x10 countersunk screws, holes are deeper and longer screws can also be used
Printed mine in XPETG by extrudr.
0,15mm layer height for mount, 0,2mm layer height for clip
Remixed one file I found on thingiverse:
https://www.thingiverse.com/thing:3452641