The Werner 55-1 is specifically designed to fit all Werner attic ladders manufactured in 2006 and older. It is important to note that if you do not have a Werner attic ladder, the 55-1 will not be compatible with your ladder.
The 55-1 package includes two hinge arms and the necessary hardware for installation. However, it does not include pivot plates. You have the option to use your existing pivot plates or choose not to use them at all. Further instructions regarding the use of pivot plates can be found in the 55-1 instructions provided.