What to seal roof rail weatherstrip channels to roof with.

Detroit Muscle Tech has the replacement
DMT Detroit Muscle Technologies Gaskets AMC Mopar Dodge Plymouth Chrysler Ford Mercury GM Chevy Pontiac Chevrolet or exact item on ebay
DMT MOPAR A Body 1966 66 1967 67 1968 69 1969 69 Drip Rail Seal Set Dart Valiant | eBay