I have only two left now but have Bushnell variables on both and the rear optics measures 1.5" and from groove in mount to the inside of the ring is 1". I don't know if those are low, medium or high but they clear with about 3/8" or so room. No problems with them.
One scope, 3.5-10-Wide Angle is on my .243
The other scope is a 3-9x40 w/Parallex corrector Bushnell Sportview "something else" is on the .223 Never really paid much attention to either after I bought and put them on.