I'm really considering the Monza shadow look by getting my inserts black instead of graphite. Torn between this slight mod and keeping the exterior OEM.
....The Monza's are so unique to the GTI that you would easily get away with having black inserts.
The way it would be best done (assuming you don't already know) is to refurb, coat whole wheel black and then diamond-cut the face, finishing with clear lacquer. For extra protection I would recommend going to A1 Wolverhampton (contact Nigel) and having their Aston Martin top grade lacquer.
I did know that's how it's done Robin, ......but only because I read your write-up on them!
It's looking like A1 then, rather than Lepsons! I'm going to aim to get them done when I'm on hols in September, then they can just have the cart for the whole week. I do like the shadows.