Original blister fenders made by Arios for the NA (1989-1997) Miata. It gives the capacity to run wider wheels with lower offset and larger tires on your roadster without compromising the look of it! It will work with OEM bumper as well as other aftermarket bumpers that follow OEM lines. Those blister fenders are replacement fenders. Arios Front Blister Fenders should be ordered at REV9 Autosport https://us.rev9autosport.com/arios-front-blister-fenders.html as they provide the best service and speed we've seen so far!