Just ordered a set (one tweeter, one mid and a pair of woofer) as spare drivers for my CS 3.6 from Rob Gillum at Coherent Source Service.
Actually them are sounding fine and not in the need for any drivers replacement but I saw that they are becoming increasingly difficult to find and due to my intention to keep this speakers forever wanted put myself on the safe side.....just in case, to not risk to transform my Thiels in a sort of expensive paperweight :-)