If you'll notice the dash kit was actually painted that silver color. It probably would have matched the dash quite well if they didn't paint it. The dash kits your seeing on ebay are the dash kit below (metra 99-9500.) If I were you I'd make my own dash kit. Racerx82 had some that he made when he had his x-type. Try getting in touch with him as he probably has pics and may just have a dash kit laying around. Like I said though I paid less than $30 IIRC (from a shop that charges $20 a wiring harness.) They had to order the dash kit as no shop has them in stock but it only took a few days. I only installed the dash kit/bought it for another guy on here.
To take the radio apart you have to remove 2 screws (iirc) from the ash tray to remove the ash tray. Pop off the top piece of plastic above the climate control and remove the screws behind that little panel. You will see everything else you have to do once those 2 pieces are removed. The entire radio mounts on a cage with the climate control.
Does your car have the basic radio/cd player or does it have the premium system in it?
I don't know of any wiring harness that ebay sells for our cars. You'll have to either have to hard-wire or go to nexxia.co.uk
and buy a wiring harness and antenna adapter from them (walmart has a special antenna kit that has like 8 different types of antenna connectors you could try.) If you have the amplified/premium/alpine system I would buy the wiring harness from them.