The difference between the 1955-56 Olds is as follows- The 56 Model 88&89's have a completely different taillight style, bigger cone shape and the bottom marker light piece is gone. On the 1955 88 model the taillight is almost the same but I (THINK) its missing the 2 small chrome medallion pieces that are next to the cone, if you look at the picture Rat Fink posted you will see what I mean..hope that helps...............JOSH
