Yes, nuts have to be removed for this application. The washers shown in one photo are for models without the molded-in inserts. You would use washers and nuts inside the hull.
We are now supplying the trolley kit as "universal" which has hardware for each possible vintage boat 12 and 14... all one kit, so there are a few excess parts.
Universal Trolley instructions here: http://static.hobiecat.com/web_uploads/2013/08/01/72020073.pdf
Thanks for providing the PDF for the folks that would need it. The extra parts are appreciated as some of those can be used for other rigging projects. I have to compliment Hobie on the 2013 PA pre-drilled holes. Makes the installation of the anchor trolley a breeze and a matter of a few minutes to install and adjust. I use mine a lot in breezy conditions to maintain a position that I need. Works like a charm!