Hello Jdazogga,

Otherwise try this:
Delock mounting set 31-piece for M.2 SSD / module

Samsung Electronics GmbH
Hello,
Thank you for your enquiry. The required screws are included with the mainboard. On the one hand, you need a spacer, which is screwed into the board in advance. The SSD is then inserted and screwed in place with the spacer. This should be clearly visible at the bulge at the rear end of the SSD.
Best regards from Schwalbach,
Your Samsung Service Team

Is usually an M2x3mm with a flat but wide head.

The screw is included with the mainboard and should be found there.