In the meantime I got my Siena's back from lepsons, Quality job!!
The wheel has a diamond cut lip, the rest of the wheel is finished in what they call AWI, which is slightly less sparkle silver then the bright sparkle finished I've had, you only really see the difference when the sun hits the wheel.
They unscrew the studs when they do the refurb, glue and refit when finished. I'm sure you can buy replacement stud from somewhere???
I kept the original studs as they seem to be made out of stainless steel and are pretty tough, plus there are none missing.
I can't wait to see what they look like on the Spider