Disappointed nobody is biting on that one!
The plan is to go for the proper 20" alloys fitted to the Exec for that year, albeit a 20" version of the ones fitted to the D4 S8 might be considered.
I looked at this and liked the look the wheels gave it in the flesh (these are 21's though and massively expensive for both wheels and decent tyres)
http://www.kaimparkgarage.co.uk/used...01405224408324
These are somewhat more reasonable albeit I need to research the offset and quality properly.
http://www.ebay.co.uk/itm/20-ALLOY-W...item3ce3afa216