Via the 365/400/412 Facebook group (https://www.facebook.com/groups/8727831092/) I got ahold of this German buyers guide - a very good article if you can understand German. It's now available in the download folder.
If you landed on this page it's very likely you have an interest in this car. So why not join the Facebook group, it's becoming very (inter)active lately. You don't have to be an owner to join, only the shared passion.
Thanks for submitting Oliver - much appreciated.