Hi Amuro,
nice question…
Meanwhile a lot of time went by, at first was the Schlumpf, then the “black phase” overwhelmed me, inspired partially by users of the HK Strida Club, who are customizing their bikes in various ways.
At the moment are, of course, black crankarms and black kick shift levers to be found on my black Strida.
These black parts were brought by my dear Mrs. Blackstridaaustria directly from Switzerland to Austria as a present. 
The silver ones I kept for Mrs. BSA’s brushed silver Strida, maybe the time brings a second Schlumpf?
Any other questions?
Warmest regards