Here's 1995 Miata M seats in original leather - on eBay for $595 now.
These are OEM leather seats from a 2016-2020 Miata. They come is black leather with red (or now silver) stitching (easily made black) or beige with beige stitching. Most have seat heaters and head rest speakers plus sliders and tilt-able back with thigh adjustment too.