The Mazda 6 wheel spacers we sell are all hub centric and are guaranteed to keep the wheels tru to the hub center. Many cheap Mazda 6 wheel spacers are what we call lug centric and will cause all sorts of vibration and damage to the Mazda wheel bearings. Our Mazda 6 wheel spacers come in 5mm, 7mm, 10mm, 12mm, 15mm, 20mm, 25mm, and 30mm sizes. All wheel spacers come with all the required mounting hardware.