I've just moved into a new house where the original owner fitted a lot of different downlights. He was a builder by trade, and he got what I suspect were an assortment of over-orders for industrial/commercial downlights, so not only are they all blaring white (and non-adjustable), but they're also in a variety of different sizes.
I'm going to replace them all with GU10 smart bulbs, of which I have several already and the infrastructure to go with it. This isn't too much of an issue for more than half of them, as the lights & the ceiling holes are a relatively standard size. The problem is that the rest of the lights are pretty big - like, way larger than average.
I ordered a bunch of these standard GU10 downlight fittings:
These have an outer diameter of 90mm, and a hole-cut diameter of 65-70mm. But the troublesome LED downlights I'm trying to replace have an outer diameter of 130mm:
...and the hole cut in the ceiling is 120mm. This means that the spring clips for the standard 90mm GU10 fitting barely touch the sides when they're down, let alone providing any tension:
I know that there are large 'cover-up' plates available, but they're literally plastic doughnut holes intended to cover scuff marks and ragged hole cuts, rather than make up for the fact that the fitting won't fit.
So what are my options? Are there any oversized GU10 fittings I should be looking for that I haven't found? I'm in the UK, and I'm faced with replacing around 40(!) of these (there are ~110 in the house total), so really don't want to have to re-plaster several ceilings just for the sake of slightly smaller holes.