WOW ~! Can't believe that I didn't think of this either but I tried it on 2 different Cascadias and here's the result: Pre 2016 Cascadias have a steel cab, aluminum door skins and all aluminum sleeper. Post 2016 Cascadias have a steel cab, steel door skins and all aluminum sleeper. That explains the rivets and conflicting info that I got. Thanks to everyone for your input.