I am scratching my head that a vinyl roof could be a factory option, but I am traveling and don't have access to the sales lit/options list at home. "Dealer installed option" very possible, but could really mean anything. In the 60's who knows??
My more basic question, why would you do that to such a beautiful car. One detail I especially like is the front door armrests, which you can see in one of the photos, just a great swoopy detail.