What kinds of screws to use in PCI-slot cover?

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As part of my new plan to do a PC audio server, I've recently acquired a couple of used computers from craigslist. Hey, these guys toss in PCI cards and don't screw the slot covers down! Crazy gamers!

What kind of screw goes in there anyway? I did a search but could not find anything. I've tried m6, 6-32 and 4-40 but none seem to work.
 
6-32

Sometimes it can be very hard to screw in because the holes are misaligned. What I do when that happens, is push the card downwards while it is in the slot to fully expose the screw hole on the chassis, get the tip of the screw into the hole first, then try to get the card back to its desired position, then tighten the screw.
 
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