On either side of the beaver panel I have two screw holes, and one hole that looks like it takes a gromet.

This panel was replaced by finny, didnt come with car from factory.

Any ideas on what I'm supposed to use them for ?

I've looked in the UK mini mags and some people run a light on one side. If this what they are meant for ?

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No more Minis!......For now.

Correct.
It is the rear fog lamp.
As seen on FSCKING Excels, on which the drives leave on at night, when they clearly aren't needed.

You have the panel that replaces the later model/UK Minis.