In 1966, if you got Dart with a 273 in it (180, 235 or 275 hp) the vin had a "D" designation. The AB spot on the fender tag for both the 235 and 275 hp versions of the 273 engines was "32". The actual vin of the D/Dart starts with LO23D62 but the IBM cards read LP23D62. The fender tag also indicates them as being LP23's