10 years later and I finally got around to doing it. I used the sheet of ABS I bought 10 years ago and has been sitting in my garage since. I got a big piece of very thin plastic, probably thinner than poster board to make a template and kept trimming it until it fit OK. Once the actual piece was in, used a heat gun to make it fit the best I could. It's not perfect, but will probably keep 98% of the crud out from behind the fenders. I removed the 2 bottom fender bolts and pulled it out some, and so much crud fell out.