2013 E Class Audio 20 Command Iphone 6 lead

[cts1975]

Can somebody point me in the right direction or recommend a suitable lead to use my iphone 6 with Audio 20 Command.
I was hoping to avoid the cheaper chinese versions off ebay if possible.
What ever give the most functionality would be great. Thanks.

[GXMAMG]

Have you had a look at these guys? No idea if they do what you need but have seen them recommended many times https://www.commandonline.co.uk