dimension

As the title says, I am getting these same stripes done on Thursday as in the photos, and I have been going crazy trying to figure out the size of the gap in between the two stripes, I have narrowed it down to either a 1 inch or 1.25inch gap, see bottom photo which shows a 1.5, 1.25 and 1 inch...

I don't mean custom as in you ordered your own color, but machined by a buddy. I can't seem to find any dimensions for the center cutout to fit the reverse lockout collar on MT-82s, diameter and depth, nor anything about how much thread engagement is needed for the M12 x 1.25 threads--if that's...