G4 Tower PCI Screw
If you have an old PowerMac G3/G4 and looking for replacement screws to secure your PCI cards. You need to look for Apple Part 922-5974.
These screws are still very expensive to get. I found a place that was selling 5 screws for almost $100! Over price for computer part in a computer that is more than 10 years old.
The specs for the screws is M3.5x 7.5mm. There are several stores on eBay that are selling the screws for about $10 for 100 pieces. Still a lot for a small screw. You may have better luck searching for similar parts at some hardware stores. I have heard that some people had luck at True Value hardware stores.