I don't have a picture of the mating part (yet). However I was able to find a source for these connectors. I sent it over to a cable supplier I use and they immediately said they know the connector and can supply them to me.
From what I've been able to find, it is actually a proprietary BMW part and they do not sell them individually, only as part of a wiring harness. The connectors they do sell (for repairing wiring harnesses) have exorbitant prices - like $35 for a single 4 position connector (although with housing, terminals and seals). So I believe any of these that are for sale are just knock-offs of the real part... probably why they don't have markings on them.