I don't recall seeing any threaded holes on the back of my FT-7900R fascia. I can confirm later when I get home if no-one else has confirmed this in the meantime, but from what I remember there isn't one.
The beauty of that plastic caddy though is that you could always fix a nut on the back of it to make it threaded and use that on the mount you wanted to use.....
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Hopefully this shows up. Having some fun trying to upload an attachment on this forum.