yea I just got to my ESM as well - but no where does it mention anything about bolt size - not even under the special tools section.
I was over at my friends place (when I first posed the question)- about to change it out for MT-90 - until I noticed it wasn't an what most are - a 3/8" drive square - so a socket will fit - not Nissan - let's be different.
I don't think so - it's kind of hard to get a real good look at it unless you jack the car up. Since I've got gorilla arms I can get to them while the car is flat - just pull back that plastic shield a bit and voila. I think it's an allan type - but it must be around 3/8" of an inch - but in metric of course - what's that equiv to? 10mm?