So I bought an m.2 ssd. At first I didn't find this standoff and screw but I think these are the right ones (they came in the motherboard box). The screw in
HELP WITH M.2 SAMSUNG 960 EVO 250GB. - Asus Z170 Pro Gaming - Page 2
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HELP WITH M.2 SAMSUNG 960 EVO 250GB. - Asus Z170 Pro Gaming - Page 2