my convert is the same way. i have a pinky sized gap between the front upper part of the seal and the Top seal And the windows are close.
if you can lift up on the rear of the drivers glass and it moves much the slides are the reason. I replaced my slides several years ago and it improved the rear top sealing but not the overall fit. My dads notes from when he bought the car talked about all sorts of leaks, windshield, doors, top, etc.
I started CAD for the slides but then the aftermarket ones came back on the market so I stopped development on it.
this is where I left off. looks like I did not get as far along as I thought.
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