I forget the exact size but I'm pretty sure they're metric. I bought some from Weaknees a while back so you might want to drop them a line. If you just need them for the cover then I really wouldn't worry about it. I usually remove the cover screws when I perform a drive update and never bother to reinstall them. The only time you really need to have the screws installed is when you ship the entire unit. If you've got the original styrofoam end panels you probably don't need the screws for shipping either since the panels will hold the cover in place.
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