I am in the process of rebuilding my suspension with Bilstein B6 dampers. I am using the old springs, but have had them re-painted.
I used parts numbers 24-066785 & 24-026161 and got one pair from Autodoc and one pair from
www.bilsteinsuspensionstore.co.uk (as that was the cheapest way). Cost just under £500 for all four.
Nowhere near to the point of driving the car though, so cannot tell you how they feel unfortunately!