What screw should I use to secure an M.2 SSD in my laptop?

I'm trying to install an M.2 SSD into my new Lenovo 15IRX10 laptop which has two SSD slots (one of which is already occupied). I have an old laptop that I previously used, but I'm not sure about the right screw to use. The new SSD measures 42x22mm, and I've got a screw from my old laptop that's seemingly 3mm, but it's too small. The previous SSD came with this triangular metal piece that I think helped it fit, but it's bent now. Do I need to use that metal piece, or is there a specific type of screw I should look for? It would help if I could share images to clarify my situation!