Exactly what are bow clips? On my 65 Valiant there is no such animal, the headliner is supported via loops in the headliner that go through the bows. All you really need is the headliner, the bows & adhesive. You should also use some insulation, the factory used a fluffy fiber material, there are better alternate solutions. All the headliner edges are held with barbs that are located throughout the perimeter of the roof. There are barbs under the window gaskets & normally the glass should come out to access although some say they have done without doing so. I took the glass out on mine.