Does anyone know the specs or screw type (size, length, pitch, etc) for the screws that mount the two heatsinks to the hashing boards?

Bitmain shipped me a board w/o heatsinks when I sent my old one back with heatsinks still attached.  Then they sent heatsinks but no screws.  My original warranty problem was reported on 2 August, and I'm still not back to full hashing on that unit because of things like this, not to mention the time when it took more than a week to hear from them in the middle of our interactions despite trying several times.  Meh.  Not happy with the customer service...  Never had to use them for the S1's, and everything was great.