On Rt. 122A in Holden, MA I saw what I at first thought was a Chevrolet Impala with a truck bed. Then I looked up El Caminos online and found out that it was really a 1959 El Camino. It had he exact same tail light setup with the bat-wing fins as the 1959 Impala.  Some pictures of '59 El Caminos ( I did not take them myself):