Eisemann G4 rebuild question

I purchased 2 g4 edition 1 mags off eBay along with a cap. There’s enough to cobble 1 decent mag together, but I ran into a stumbling block that I didn’t realize in the pictures when purchasing. My cap does not have any contacts in them. I watched a video of a rebuild of one and took a screen shot of what I’m talking about. The cap has 4 black contacts where the rotor touches when it rotates past it. What are these called, and how do I get them for my cap?  [attachment=77248]IMG_9470.jpeg[/attachment][attachment=77249]IMG_9471.jpeg[/attachment] [attachment=77248]IMG_9470.jpeg[/attachment][attachment=77249]IMG_9471.jpeg[/attachment]

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Magneto Rx: - Eisemann - G4 - G4 Early Version - Silver Star Equipment LLC Store (oldcroak.com)
maybe have parts - Eisemann G4 Magneto Brochure (oldcroak.com)