Hello It was suggested that I refer my question to you. I have a friend that bought a 77 NYB St Regis. The data plate has code M51 which in three sources I found shows that is for a power sunroof. His car does not have a sunroof. We are trying to figure out the mystery of whether his car was to have a sunroof but does not or if M51 means something different on 1977 NYB. Thank you
