I followed the advice of others and used my wife's unused yoga mat - The one I used was 1/8" and very pliable in a nice rich blue. I has a tactile stickiness to it so it won't slide around and my liners will sit more securely. They traced and cut very easily and conformed nicely with all the curves and slipped under the bracket that holds the rubber strap for the owners manual on the left side. Worked Great!

Who needs them next?