Unknown Letter

Various letters are found on some Baltimore and Kansas City trim tags. Below are some of the letters along with the Fisher Body style number it/they were found on as of July 19, 2014. Sometimes there is no space between the letters and sometimes there is. Their meaning is not documented but there are some trends that one can draw their own conclusion from.

Baltimore:
B - 13669 Malibu 4-door sedan
B L - 13637 Malibu sport coupe, 13427 300 Deluxe coupe, 13437 300 Deluxe sport coupe
B M - 13637 Malibu sport coupe, 13639 Malibu sport sedan
F - 13427 300 Deluxe coupe
L - 13667 Malibu convertible
M - 13667 Malibu convertible
B F L - 13680 El Camino
B F M - 13680 El Camino

Kansas City:
L - 13637 Malibu sport coupe, 13680 El Camino
X - 13427 300 Deluxe coupe
X L - 13427 300 Deluxe coupe
X Z - 13427 300 Deluxe coupe, 13236 Nomad station wagon, 13480 El Camino
Z - 13437 300 Deluxe sport coupe