Does anyone know if you can buy rear inner fender wells or some sort of skirt to go in the inner fenders of these GMC/Chevy trucks to cover the undercarriage? Years ago I remember seeing them in JCWhitney for the older trucks, but have had no luck finding them anywhere now that I want to purchase them. I could never understand why GM always left everything exposed anyway, whereas Ford and Dodge neatly cover it all up with a nicely finished inner fender. Any help would be greatly appreciated.

This has been discussed before. Try this link: http://dieselplace.com/forum/showthread.php?t=7673&highlight=fender+liners. Some others bought material and made their own, others painted the inner wells black.