69 dart ext. windshield trim ?

You will need the lockstrip as manufactured by Precision Rubber Products. It is part number WLSD690A. It is the mylar piece that is used with the WCRD690A windshield gasket. Most of the larger vendors carry them and PRP is the only manufacturer of a correct piece. They are pricey and due to the length, they have to be shipped "oversize" which adds more to the cost.