I would suggest emailing Paul at FHF. I just had a communication with him this week and was very happy with the outcome.
Secondly, toward the end of last year he asked for people to comment on the fit of particular binoculars in his various size cases on his Facebook page. I don't recall how he wrapped that up, I think he produced a table, but he should be able to provide the info. This would be good to see as it includes customer feedback on the fit of his various sizes.
Lastly, I have his previous "small" case (up to 6.2" binocular height I believe) that I bought for some Zeiss Victory 8x32s. More than enough room there. I just bought a pair of Meopta Meostar 10x42HDs. According to the FHF site, the height of these indicates they should fit in my case. They do, but with the eye cups extended they fit just barely.
I like the FHF stuff and it is good to support a small US guy.
You might ask this over in the optics forum to get more responses.
Good luck,
Doug