I am not aware of any off the shelf rubber mats. However, try Coco mats.
Cocomats were produced by Porsche, Mercedes-Benz, BMW, and other European manufacturers as the factory automat. Updated with a nibbed rubber back, our cocomats come in 17 different color combinations to complement the interior and exterior of any classic or new vehicle.
cocomats.com
They have three non carpet versions
Coco mats
Echo mats
Woven vinyl mats
I have the Coco fiber mats on another vintage car. A layer of woven coco fiber on top and a very heavy rubber layer on the bottom. They are at least 0.5" thick. Not cheap; but, correct for a vintage (European) sports car. If they do not have an existing template for the NSX they will make the mat to fit your template at no extra cost.