http://www.e46zone.com/forum/topic/47668-clubsport-gearknob-re-trim/

That's the guide I followed with the eBay ad linked at the start. I wasnt remembering the price correctly so I think it must have paid more..
As the guide says, when you're paying for the cover you can leave a message for the seller. Ask for the cover for the gearknob with 2 stitch lines and a silver base.

The guide is pretty through but I'll post up the pictures I took of mine if you'd like?

PS: I got my club sport knob off of adverts for €5