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The screws you are looking for are 8-32 flat head phillips. Try a local hardware store. Some of the tru-value stores have a great selection. Or search the web for flat head phillips screws. Lots of info there.
http://www.smallparts.com/products/descriptions/mpx-f.cfm
The problem I have had is that the screws go into a female threaded end that is also countersunk. I have checked every supplier and all seem to have discontinued them. Thanks for the help.