In 1958, an improved model, the ZIL-157, was introduced. It differed outwardly by its grille and having single rear tires, instead of the ZiL-151’s dual tires. Both models remained in production side by side until 1966.
In 1956, the Chinese began license building the ZiS-151 as the Jiefang CA10 at First Automobile Works, with slightly more power and angular front fenders. The improved single tire CA30, introduced in 1958, remained in production until 1986.
Additional Information: en.wikipedia.org/wiki/ZIL-151