I have that problem too. The rear glass as well. Hell the whole firewall leaks. I never seen anything like that.
How do you know for sure it's the window seal? From what I read, it could be the window seal, the wiper pivot seals, all the freaking screws that dodge/plymouth decided to run THROUGH the firewall (didn't any of them hear about rain?), or it could be your cowl is clogged so water is overflowing into the cab. Oh, could be the steering wheel shaft seal too.
I have water coming in through ALL of those orifices. It makes me want to tear the dash apart and spray the inside with that sealant you see on TV that seals against water. I think it's called FlexSeal or something.
Have someone spray your windshield and cowl with a garden hose while you get up under that dash looking for leaks. I don't have any pictures as of yet, but maybe over the weekend I get some of my problem areas.
We might be able to work together on a solution!