Conversion to manual steering

I've always had to change the pitman arm when doing that. Maybe some fit both so wait for others to comment.

You can use that adapter but you can also punch out those plastic inserts in the steering column as they're only used for assembly. You can then pull the column down a couple inches further to connect to the manual box
No need to punch anything out. They don't penetrate the inner shaft. They are just four globs of nylon