65 Valiant Headliner piece together

Also I have these headliner brackets the keep it tight and I know they came out of a 4 door, everything lines up but the front screw location. Should I trim it and redrill the screw hole? Does anyone know where to get replacement clips that hold these brackets to the car? Lastly on the sail panel is there a fiber board or cardboard filler that goes in before the headliner?

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