Hello All,
My two FFRs Series III have what looks like an extended arm coming from the window frame. Looks like a piece of round pipe that has both ends heated up and then hammered flat. That probably gave more clearance to see away from the antennae mounts. I also have a couple of civilian Series III and the mirror arms are minuscule in comparison to the FFR ones.
There are two different mirror heads on one FFR and only the arms left on the other one.
Kind Regards
Lionel