Somehow I lost ONE nut cap on my 2014 Miramar 34.1. Ford F-53 chassis with 22.5" wheels and 1.5" nuts! 33mm caps will NOT fit, they are too small! I've read that several people have used 33mm for their RVs, but not Thor/Miramar. Good value for money. Extremely close to the factory covers, you won't notice any difference when driving. The originals have a slightly larger flange on the wheel. You should know which the replacement was. Happy with the purchase.