M ounting Metal Front Window Garnish Molding/Sun Visor Base 1935 Ford

[Henry Ford IV]

I am trying to attach the metal piece that goes above the front window. The sun visors mount to it and the windshield wiper controls go through two holes that it has. My question is; What size screws and where or how many? It looks like garnish trim screws will work, the same ones as in the garnish moldings around the windows. However, there seems to be bigger holes in the metal piece than the size of the screw heads. What am I missing?