Your rear rotor guard looks like an old "LR Replica" piece.......Larry Roeseler had a company back in the early 90's that he called LR Enterprises and he specialized in Kawasaki guards and accessories.....He also had the riding gear company XTREME make his his own like of riding gear called "LR Replica"........
I agree with everyone that I have never seen an OEM style tank come in "natural"........Might be an IMS one off thing.