There are undershields and ZF 5 speed transmission, luggage, luggage rack - all very rare options.
I would vote for spare wheel cover for Hinweiss. I is something factory would do. As antenna was not amongst options, the owner could order it with the dealer, who might just ask where it should be (both front and rear were available).
But there might have been something else, that is not even mentioned, related to suspension or engine.