Screws for Alesis Command Module?

Does anyone have the size of screws for Alesis Command module to mount on the connector? Mine didn't come with any. The one that attaches to the black mount that goes on the rack, I see it was supposed to have 3 screws. Since it doesn't I am just going to buy some machine screws or something. I am tired of it falling off because my leg hits it. Thank anyone who can help.
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