When we brought the first BK into Oz for NSW Polair in 1987, some options were limited:
We wanted a nose-mounted NightSun - sorry, it can only be on a tripod on the right side behind the door.
We wanted adjustable pilot seats for height and reach - sorry, fixed height only.
When it arrived, we found a catalogue of parts, some of which included nose mounts and adjustable seats. We bleated, "Why didn't you let us have these options?"
The answer: "You bought in Oz, which is in the sales area for Kawasaki. The Japanese are all a standard height, so no adjustment is needed for the seat."
"OK, let's buy the options from the Bolkow sales area and get what we want"
"No can do, Deidre, this new aircraft can only come from Japan. No German parts. Bye."
So, you might have a machine that was originally from Japan, not Germany, which might be why the options don't appear visible to you.
(The BK went for a swim 8 months later, written off, bought by a Tazzy firm and rebuilt. Subsequently crashed again a couple of years ago IIRC.)