Early A Dash Frame Installation "Doubt"

Yup, a rubber trim strip went into those holes on cars without the wide base windshield pillar trim. Convertibles had them as well as many 4dr's and lower trim level cars. Higher level trim cars use a plastic pillar molding with a wide base that covers those holes. Dashes that came with the rubber strip also have a screw hole at the lower end to fasten the rubber strip to the metal dash.