1984 300TD water in back seat footwells

[chrisgt]

My 84 300TD has had this problem for a while so I've just parked it under cover, but I want to start driving it again.
When I wash the car or it rains, I end up with water in the back seat footwells. Sometimes on the driver side, but a ridiculous amount on the passenger side.


I know that it's a common problem for the water to leak in under the windshield or somewhere up front, but this appears not to be that. If I pull up the mats, etc. in the front seats, the floor is completely dry. I had the windshield and gasket (oem MB gasket) replaced several years ago and they said there is absolutely no rust up there. This car is in very good shape with no rust.



Would this be broke sunroof drain tubes? Leaks where the roof rails bolt up?
I'd like to know if it's anything common before I have to go remove the headliner, that doesn't look like very much fun.