That sight is actually a Lyman manufactured sight. You might check Brownells catalog for it because IIRC it comes in several different heights. You should find a formula in their catalog or on their website that will tell you what sight height you need once you plug in the needed measurements.

Go tell the Spartans,Travelers passing by,That here,Obedient to their laws we lie.

I'm older now but I'm still runnin' against the wind