It appears to me that the X front door height opening (measured vertically from the rearmost flat section of the top of the sill up to the inner edge of the seal at the top) is several inches more than the S. I have not measured an X. On my S that height is about 33.5". Anyone have that height for the X front door? The photo below shows how I measured the height I am referring to. It looks more than 33.5" in the photo because I took it looking down. Thanks.