I just got my Marsupial's in, size Small. I like them better in every way except for the straps that connect to the binocs. The Marsupial ones aren't bad, the MR straps are just better.
My Cabela (Meopta's) 10x42's are 5 1/2" cups in and 5 7/8" cups extended.
The Height measuremet is just...
I've got 42's and a Mystery Ranch as well, I always find myself fumbling around with one hand trying to get them out. I'm hoping the Marsupial's will be easier in that respect.
Did you buy a new one?
I've got a GMG going on two years now, been great, use 2-3x a week. With that usage I'm just waiting for it to burn out and will need buy another one.