11 cm

I don't think so. So you want to connect a "normal" steam nozzle? That probably won't work. De'Longhi Dedica Arte has something like that ... :)

For example here https://komtra.de/delonghi-ersatzteile/delonghi-ersatzteile-ec-850.m-espressomaschine/siebtraeger.html?page=categorie&ag=996514&cat=776. I have ordered all spare parts and can only recommend it.

The way I see it, the steam lance is different... meaning the 860 has one... and the 860 is a bit newer... would certainly go for the newer model. I no longer have my 850 but was happy with it for a long time, at least for a start:)

No, unfortunately we do not offer this machine in the colour cream.

Sorry, this question is not formulated in an understandable way. With which "new machine" are you comparing?