I am very interested in your rework of the Recaro seats. I have been seeking information and sources of materials, but it seems to be scarce.
I have a set of the Recaro spectrums like yours, but even older, that do not have the electric controls or headrest speakers. Mine are all manual.
There is an eBay seller of the cloth material, but only in grey - silver - black; I wondered if it was decent quality.
Anyway, I will share whatever I can find out. Here is the only pic I have of mine:
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