I'm afraid you're most likely going to have to first mount the receiver peep sight on the rifle, and measure the distance above the bore C/L (most easily seen/measured at the rear of the bolt) the aperture falls when the sight's in the middle of it's elevation adjustments, allowing for clearing any vacated scope mount base(s), of course.
The same would apply with any other style peep sight, too - like the NECG & XS clip-on's, or scope base with a small folding pop-up peep.
The total height of the front sight, w/ramp, should equal that measurement, less half the muzzle OD.
The front height can be divdided up between ramp & sight blade any way you want.
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