Console screw guide? (no really)

I've got an NES, Genesis and AES that were taken apart for cleaning and in a brilliant move, all of the screws in their little zip locks are gone.

Is there a guide somewhere that has the sizes of screws for consoles? Better yet, one that sells kits? I can't find anything really.

I'd rather not have to buy junk consoles just to rob them of screws.

Screws.

So...would you say you are screwed? on a serious note I ha e a model 1 genesis, an aes and an nes. I can take pics of the screws with something so you get their sizes.

Regards.

When that happened to me, I took the case with me to the local hardware store and just test fitted a bunch of them until I got the right one. It was for the Power Base Converter which uses the same screws as the Genesis, but I forgot the size that I ended up selecting off the top of my head.