The running board mats are the correct size for installation. Since they are rubber, their length will vary depending upon the temperature. It is recommended that the running board mats be laid out in the sun to warm up prior to installation so that they can be stretched if needed while being installed on the running boards. Once installed correctly on the running boards they should not shrink back to a smaller size.
The running board mats on my car were installed almost 30 years ago and they have never shrunk in length.
