OK guys!!!
Got some info for you.
For the ESB MPP, you'll want to be using 10/32 1" long machine screws, with the nuts that go with them.
they work PERFECTLY, just a touch of the screw peeks out past the nut, as well the nut is fairly shallow, in fact as soon as you up one size the nuts just about double in width. From what I can deduce, 10/32 would be appropriate and likely what was used on the real deal, for the simple fact that it would have to fit through the clamp as well as fit the threads of the MPP side plate.
Now if you ordered an MPP kit from me you wont need these parts, because I will be providing them, they will however be silver, and NOT brass. I tend to beleive the yellow tint is caused by the lighting in the carbon freezing chamber. If it were brass it would appear extra yellow, instead of washed out.
Th eonly remaining question is WHAT kind of screw should be used on the clamp, All things considered, I am doubtful of a philips or slotted screw, it just doesnt seem to fit in with anything else...I thought maybe a small hexbolt, or some type of allen screw would just fit better. And afterall this is just a screw, so if new info pops up later, its an easy and inexpensive fix