[mickmate]

Mine are the M12x1.75 thread and the wrench is a 12mm allen. The holes measure 0.480" across the flats and 12mm equates to 0.472". I also noticed the taper on the bottom of yours, mine are flat?? Turning the OD may be an option but I would see if you can get an allen wrench that will fit first. You may have to hex broach the holes first. That not being feasible I'd call Bob and get some new ones shipped out the quickest way you could get them there. If you're using the M12 thread I could send you mine and the wrench for them if that will help get you rolling quicker. Nice drawing of them!