90 E30 conv. top/door water leaks

[Manstersr]

Anyone had luck with sealing up top gasket where door corner above quarter window meets the top gasket and windshield frame header gasket? When it rains, I get a slow annoying dripping from the corner where the roof, windshield frame and door intersect. I don't know what gaskets are available except the front roof header gasket through dealer for $900+. besides, I'm not sure which one will do the trick. I have replaced the top header line up pin covers (plastic cones) before everyone asks. Any suggestions would be appreciated, especially if it's something that has worked for you.

I've thought of trying liquid rubber if I can still find it at the parts stores and spreading a thin-ish coat and covering with wax paper before closing the door to prevent it from sticking but allowing it to shape to the door window frame.