Genuine Mazda Miata Alternator Belt 1.8. Your belts need to be checked every 15000 miles. Hate to be on a trip or going to work and have this break. Genuine Mazda Miata Accessories and Mazda Miata Parts offer the style, comfort, quality and satisfaction that make driving a Mazda Miata even more rewarding. Designed and guaranteed to fit your Mazda Miata perfectly inside and out, they are the only accessories built to the same quality standards as your Mazda Miata.