Where can I find some nice small hex head bolts to replace those shitty little screws that hold on the brake and clutch reservoir covers?

What size?

I scored some from my local Home Depot when I was making the base to my CUNT Box (photo below), but sadly, I don't recall their size:

You want flat head allen screws don't you?(Like stock except allen head) If you can't find them I can get them at my local ACE hardware store and mail them to you.