http://www.allparts.com/Black-Bridge...s-0009-003.htm
These would likely work.
It's likely a METRIC screw, as it's an import bass, but I could be wrong.
I'd go to a store and ask if they have any parts lying around.
Or ask in the classifieds here.
If you have to, you can remove another screw and take it to a hardware store and see if they have a match.
Or Fastenal may have it. They sell nothing but screws and fasteners.
Or go to GC and take one from their basses. No one would notice, as most of the basses there get neglected.

(NOTE: That was a joke. Don't get arrested for stealing a $0.03 screw)