We have more than 500 different sizes in our assortment for you. We offer high quality centering rings made of poly carbonate or PA6 GF30. The dimensions for the centering rings you need, you will usually find in the ABE of the rim. Alternatively you can also measure the bore of the rim and the hub of your vehicle. Ideally, you should use a caliper gauge for this. However, a folding rule or ruler is usually sufficient for a rough determination.