A quick search didn’t find any previous mention of Ridies but they look like a possible resource for interior pieces:

https://ridies.com/Product/26040/1970-1978-Datsun-240Z-260Z-280Z-Genuine-Leather-Seat-Covers

I have seen those before in other cars.   They look very nice. I like them but since they look a bit elegant, I don't feel like they match the car.  I am sure they are more durable than the standard vinyl too.

If they had a cheaper grade of leather that looked more like the cheap vinyl that came with the car, I would do that in a minute.  :)

Interesting... Same picture as Interior Innovations

http://www.interior-innovations.com/assets/uploads/66350-IMG_0434.jpg

Good catch — others spotted that, too. Innovations shows a Michigan address and Ridies is Indiana, but maybe they both work with the same supplier?

”I replaced the foam in the drivers seat and went syntheic. Covers are custom made in Pakistan and delivered to your home in about a weeks time.”

https://www.corvetteforum.com/forums/c6-corvette-general-discussion/3942135-feedback-on-ridies-seat-covers.html