I got hold of a set of carbon wing mirrors at a very good price, but with flat glass.
The existing wing mirrors I have on Eugene are convex, and I prefer that.
So - I've spent ages trying to source convex glass.
I even ordered a large cheap 'chinese' convex car mirror, with the intention of cutting it down to fit the 2 wing mirrors.
That didn't go well!
(Good job I was wearing protective glasses!)

Anyway, after failing with Summit, Halfords, etc, I came across https://phoenixwingmirrors.co.uk.
Spoke to Luke there, and all sorted!
Very impressed with his knowledge and assistance.
They also do Instrument Gauge Glass as well as any mirror you need, from Flat to Deep Bend Convex.

Carbon Mirrors