I have modified headrests too. But no information about when or who did it.
The alcantara roof was installed by our sponsor, Prestige Motors after the Annual Meet 2018
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Johannes
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Audi S8 -99, Pearlescent, Alcantara/silk napa leather, Burr walnut insert, Alcantara roof lining upper pack
A8 32V engine
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Jeep Grand Cherokee -98