If you look in Gerald Krahn's first series blue 2 ton dump truck, it looks exactly like the one I hope to get, but so does Matt Droege's 2nd series 1955 Chevy 6500. They have the same mirrors, cab, glass, and front end look and shape. But on Clayton Truman's second series Chevy tanker truck, it has the grille that looks like a grid. I also noticed some of the 2nd series have the fender lights on them. How can I tell them apart?