The Disklok range caters for all cars, motor homes and light commercial vehicles with 3 different size options.
Each Disklok has built in adjustment of 1 inch which allows you to find the perfect size for your steering wheel. When fitted correctly, the Disklok should be loose enough to slide around on your wheel but not loose enough to lift off.
The way in which to determine the correct size for your vehicle, you need to measure the diameter of your steering wheel as shown below.
For further information, please see the fitting guide here