Agamemnon

Hi everyone. Yesterday I noticed that one of my bridge bolts that holds the 2 halves of the caliper together had backed out and is now gone and lost for the ages. The other 3 have been re tightened and seems to be keeping everything in good order. I need to find a replacement for the 4th bolt. However Nissan doesn't list this with a part number because the caliper isn't supposed to be split. My question for everyone is, what are the specs for this bolt? Anyone know the length, diameter, thread pitch, etc? I don't want to take off another bridge bolt for fear further damaging the caliper. Has anyone with crap caliper laying around can take some measurements for me?