I have found some other connectors which are not listed in the official ETK. Some people on the German E34 forums want to make a list of those plugs and connectors which are available at the dealer but not listed in the official parts catalog. Apparently that is only for "internal" shop use.
For example I found the parts for the connection engine oil level on the oil pan, the male part and the female part. someone in Germany bought it from a Bosch shop for me.