The mirror seems to be a ring in
Attached pics of the factory sort DRiving a MK SS on the wrong side of the road will be tricky. WE are facinga similar but reversed issue here. A LHD MK IV DHC. Yous isn’t quite as bad as the saloon has a better rear window
I tend to find wing mirrors a bit like looking through the wrong end of a telescope
Although I drove my MK IV for decades with only the inside mirror, I have now added an outside. I seea lot of Mk IVs etc with added mirrors and there are some shocking mismatches of style. Modern Holden mirrors that are probably quite ultilitarian but ugly.
I used a Raydot oval mirror of the same style the factory used on SS 100s and some SS1s and I think it fits in in style and works quite well.
With the interior mirrors, they are occasionaly available on ebay uk, but the come with more than one type of base. Different angled depending on where itis mounted. The Mk IV DHC e.g. mounts on the
header rail and is different o the saloon which mounts on the dash.