[sc_rufctr]

The 964 windshield is slightly bigger than a 911 so the seal is different.

But according to "aftermarket glass people" the window openings in the body are the same on all 911s (911, 964, 993).
However I'm not sure how true this is because I've never confirmed it for myself and people have had issues fitting
a 964 windshield and seal in a G Model 911. (It doesn't fit - too big)

What people have done with success is the installation of the 993 windshield and its glue in seals on a G Model 911.
This works well and I've seen it first hand. Very neat and tidy.

What I would like to try is a G Model 911 windshield using a 964 seal in a G Model 911.
It may be a bit loose but a bit of sealant (non hardening) in the right places may fix the problem.

And just for info...
A friend in the local Porsche club has been running an SC with just the glass, rubber seal and trim.
He uses no sealant at all on any on his fixed windows and has never had an issue but his car isn't daily driven and rarely if ever sees rain.

This subject has been talked about a lot here. Searching is a good idea but it can get confusing.