Installed these Retro Seats into my NA Miata from Retroseats.com : Miata | Miata, Miata turbo, Mazda miata
MX-5 Leather Exchange Seats (set of 2) Black Diamond Stitch
Mazda MX5 - Seat Surgeons
LusoMotors - Two LusoMotors-RCC MK2 seats samples: XL and standard width. The standard width “Mazda” one, fitted with specific MX5 NA/NB seat mounts. The XL, with a nice lime green stitching work.
2004-2005 Mazdaspeed Miata Black Leather Seats / Pair / NB141 - Redline Auto Parts
Striped Seat Covers For Miata NB1/Mk2 - The Ultimate Resource for Mazda Miata Parts
NB] Will bucket seats give me more space? - MX-5 Miata Forum
Mazda MX-5 / MX5 NA /NB Seats, Car Accessories, Accessories on Carousell
Nakamae Sport Seat Covers For Mazda Miata MX-5 NB | REV9