No piece goes there. The lower plastic molding has shrunk. I do know that the bottom stainless trim fro a hardtop does slide into the pillar molding on my 68 Dart convertible. You could get a damaged one and cut a piece as a filler and some silicone or buy the replacement molding. fits 67 Plymouth Barracuda Dodge Dart Convertible lower Chrome Windshield trim | eBay
