Details for Mac Color Classic logic board back panel screws

I bought a non-working Color Classic and was able to get it running again after recapping it. One thing that it is missing that I'd like to replace are the two screws that secure the logic board's plastic back plate to the frame. Does anyone know what they are and where I can order a replacement set?
 
I don't know where to get replacements, but the exact same screw diameter and spacing is used on the Apple PDS/Nubus cards for the riser card on the Quadra 610 and PowerMac 6100.
 
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