I have my Kufatec Lead for sale (Comes with Aux In).
Perfect for anyone doing an RNS-E Retro-Fit or anyone wishing to update their older RNS-E to have Aux-In via 3.5mm Jack.
It has never been used, due to sale of RNS-E unit.
It's listed below. Looking for about £40 for it. It cost well over £50 new with Postage and Packing and Euro Exchange rate.