I've been down this road. Henckels didn't make those knives, so they don't have any parts. Boker made them under contract, and when I contacted them the answer was, "Please send your mail to Henckels, we are Boker

" Eventually I found out that Boker sold whatever spare parts they had to a fellow on the west coast whom I was never able to connect with.
If you have better luck I'd sure like to hear about it.
About all you can do is try to find broken knives that can be salvaged for their shields. It doesn't happen often, but they do turn up.