If you read through the narrative by the seller, she (I think) says "The interior was completely redone, new old stock aviation upholstery in the same color and pattern was sourced". I read that as this was the same as the original fabric from the factory. I know that some of the later Bertones had some pretty wild upholstery colors, but I am not really familiar with what the Scorpions came with.
From the second paragraph:
The interior was also modified by covering the seats in checkered cloth from the aviation industry.
Fourth paragraph:
The interior was completely redone, new old stock aviation upholstery in the same color and pattern was sourced, new carpets fitted, the floors were sanded and treated with POR 15.
I took that to mean Mr. Keppleman had the interior done with aviation upholstery and the interior was redone in the aviation covering as originally done by Mr. Keppleman.