If anyone is interested, I have 7 sets of 6 inserts. No extra matching bolts. The matching bolts are M5, I would get a 16mm or 20mm. I bought my bolts from Home Depot - pretty standard thing.
My inserts are a little different (and better, IMO). They have a flange to prevent the bolt from slipping through and it gives a flat area for the epoxy and bolt to be mashed together with a clamp.
5/16" drill, 1/2" countersink (BARELY countersink, don't tear through the plastic with the 1/2")
$6 with shipping to lower 48. Let me know if you're interested.
