Kick panel replacements can be made from 3 ply or 3mm MDF.
MDF is easier to work and sand to get a better fit.
If you have originals and they are basically complete but bent or twisted, remove original black pvc/plastic facing and put on flat surface and hose with water until compliant.
In some cases you can save the instructions for windscreen washer-it can be stuck to carpet. If it won't come away easily use a hairdryer but not too hot.
If you have steam cleaner you use that instead of hose. Flatten and put weight on until dry-this will give you a good template to trace straight onto MDF (3mm) .
If your panels are still sound but don't look too hot you can cover with marine or similar carpet which is pretty cheap at Bunnings.
