My 54 also leaks .when the window was replaced it was done by a glass outfit .It leaked in the same spot yours is he came back and put some sealant around it and it was okay for a few years but now it is leaking again. I was at the glass shop and was told that they would have to take the window out and clean all the sealant off .Said it would be cheaper to get a new seal as it should seal without the sealant.The sealant was a urathane that is used to glue newer windshields to the vehicle.
Urethane is the wrong type of sealant for your windshield. It calls for a sealant type which does not become hard.
You need a new glass guy, bless his heart. He should know that these windshields do require a sealant and which kind is called for.
