A friend recently asked if the roof lines were the same on the' 51 Kaiser two doors and four doors. I assumed that they were but in looking in the '51 parts book all of the '51 models used a different roof except the business coupe and the club coupe. Five different roof panels but I found it interesting that the coupes, 2 doors and 4 doors all used the same deck lid. Sometimes the parts books make for interesting reading!