Does anyone know if liners are available, from Ford or aftermarket, for the rear wheel-wells on an 06' F-150 screw.

 

I wouldn't go automotive for them. There should be some black rubber skirting you can pickup from craft stores, vinyl shops, flooring contractors, somewhere. You might even find scraps from an industrial job that a contractor has left over. Anything black, shiney, and somewhat flexable will do the job.

 

Check out agricultural supply as well. We had to fix up a wood floored manure spreader and the boss brought home this heavy, tough black plastic about 3/32 inch thick. I've thought about getting some for my van to protect the heater/ac lines exposer in the rear inner fender area.

 

I found some big truck mudflaps and buit some, way better than fords crappy plastic ones. Had them on now for about three years now, the origanll ones lasted for one trip down a muddy road in the oilfeild.

 

I got two cans of 3M undercoating, power washed the wheel with detergent, rinsed, and let dry. Masked off the fuel lines, and put three coats on. That was 4.5 years ago and they still look nice. Don't have to worry about something falling off the truck or rubbing sand and salt into the body where I can't see it. Spent sometime in the Midwest where, "Rust Never Sleeps"