L-Pad question Re fitting

diyAudio Member
Joined 2007
Anybody here familiar with the Realistic 40-977?
I've just got a pair and I'm wondering how best to mount it in the baffle.
Just eyeballing ; it seems to be a single unit and the rear housing for the resistors seems bigger than the faceplate
 
I'd normally drill a hole the size of the front level control ring, round the outside of the hole and rear mount the unit.
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That said, it looks like the pad might fit through an octagonal shaped hole and still allow the bezel to cover it.