Seriously doubt it - I'm no expert on Mondials. but do not recall after market seats ever being offered as a factory option on any model.
As others have stated, Recaro seats were never offered in a Mondial. There have been other owners that have installed Sparco seats into the Mondial. Those Recaro seats look comfortable. That looks like a Mondial that was being offered somewhere... eBay or Craigslist? I could almost state that I've seen that car advertised somewhere before...