@Manuel.steffens:
The screws you need should already be on the board, if the length is different from the one you want to install, or they are included in the accessories supplied with the mainboard - usually in a small bag. Otherwise, as mentioned by the previous speaker, ask Digitec or Gigabyte support. You can't send me a PM here, can you? Otherwise I would certainly have sent you such a screw...

sorry... I'm not taking my board out to look (but I had no problems with the installation myself...); if the screws supplied are faulty or the set is not complete, I'd contact Gigabyte; they'll send it to you...
or Google search for something like this: https://microconnectors.com/m-2-ssd-mo...