Current online brochure from VW uk site here:
http://www.vw.co.uk/assets/pdf/golf_hatchback_brochure.pdf
They do look like all silver without the grey inserts. Just checked my 2006 brochure and it is the same pic !
The pic on pg 16 isn't actually showing the Monza II rims. Look at the clearance of the brake calipers! I guess they couldn't be ar$ed to photo a "real" Monza II, and so put a pic of the 17" Monza, hoping no one would notice!

Ordered my car in July 2007 and got a MY 2007 spec delivered on 25 September - my Monzas have the grey inserts though 
Simlar story here, ordered ours end of April 06, build week 26/06, arrived at stealers in July, and took delivery on 1st Sept. It defo is a 2007 model year - you can tell from the 10th digit of the VIN. The 18" Monza IIs defo are high polished, lacqured outer face, and anthracite grey painted inners.
Rgds