Dell Inspiron 1750, what size are the screws that hold the back cover?

I’m trying to fix my wifes computer as it fell the other day and started saying it couldn’t read the hard drive. When I checked it out I realized the back cover is only held on with maybe 3 screws, and for a kicker the hard drive isn’t screwed in either. I pulled one screw and put it in a new spot which is working for now but I’d like to reconnect the rest of the back as well. When I referenced the teardown guide below it listed that they are 2mm phillips screws, but didn’t give me lengths. I’ve found some bundles that are 3mm, is that long enough?