Ohhhhhhhhhhhhhhhh ok that might b it .. duhhhh lol. I wouldnt think that anyone would use a single nowadays. I know i have the right channels and everything programmed right just nothin will move. The shop where i bought it said he just put a crystal in it and programmed his radio. HOw can i tell if its a single. THe one i took out is the same size and dimensions and is a 72 . I dont know .. Any other thoughts