Early A manual steering

Does any one now if their is a difference in manual steering boxes for 66 and older darts, cudas etc, than the 67, and up manual steering boxes,?? I have one but I don't know what it came out of. I want to change my Dart project to manual.

Also.... has anyone replaced the seals on the steering gear end. The FSM uses a special tool for removal, and installation. I'm thinking that it might be able to be changed without the spec tool.

Thanks barracudadave67