someone gave me a PLASTIC fender off of (what I think) a silverado. Looks like a 1999 and up type bedside fender off a silverado...but i cant seem to find exactly where it came from. It has z71 decal on the side and its PLASTIC.not even fiberglass. anyone know what years or what chevrolet/gm trucks had plastic bedsides? Its not a stepside just a normal straight fender.