Install the bracket on the car. Position the molding over the bracket and push down gently until the top inner edge slides into the top of the bracket front to back. When the top of the molding is completely in place push down to snap the bottom in place. Align the molding and drill the holes at the ends.
A tip is to lightly round the corners at the top ends of the bracket. The repro molding is a softer alloy than OE and the bracket may slightly dent it during installation.