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I have a large central high mounted screen mirror.

I have two mirrors on currently, I only fitted the left hand one for her indoors, I can't see much out of it.
Unless it's changed you only need one on the drivers side and the screen mounted mirror...

According to CBS they are IVA OK.
But I take your point about folding on impact.

Car Builder Solutions
https://www.carbuilder.com/uk/lightweight-aluminium-gp-mirror-polished-100mm
I've made ally brackets that fit onto one of the pillar screws.
Hopefully radiused enough for IVA...

They maybe S&J or Europa, they both do them.
I've gone with the bullet ones this time, as I've sold my previous ones like Charlie's.