Hi,
If you send these guys an email with the color you are after or the color code of your car they can quote for you.
http://www.porscheshop.co.uk/acatalog/porsche_boxster_coloured_dial_kits.html
I think they charge a bit extra for special colors.
There is also a place in Germany that does them pretty cheap that usually post on
www.ebay.de but cant see anything there at the moment
Cheers.
Steven