comment: >
  
  Oh, and the reason for using plate mount stabs is because screw in stabs sit a lot closer to the edge of the PCB and plate causing the o-ring to jut out. Theoretically, if you could find a soft, slim o-ring, you could still use screw-ins but I doubt you can find any 30 or 40 durometer 195 mm o-rings. I've only been able to find them in like 70 or 80 durometer.
context: I'm working on this right now for mine. I can give you a few pointers, but I haven't finished mine yet so ymmv.
  You'll need plate mount stabilizers.
  O-ring OD diameter needs to be approximately 195mm
  4mm o-ring width is too thick. I'm currently trying to find one around 3mm. Durometer selection is going to be pretty slim with these sizes. 
  I'll let you know what else I find out! >
  
  Thank you so much! Is it firm on the plate mount? I have some screw ins on hand that I would prefer to use. But if it’s needed for the oring to sit properly on, than I dont think I mind picking up a cheap set