The first generation of BMW is a common problem with the accumulation of water under the carpets of the front seats. It usually falls through the crack between the glass and the door seal, then flows inside the door, accumulates there, saps the vibration, and then drips past the threshold lining below or on the mat. To prevent this, you need to make extra glue in the interior of the doors so that the water does not fall on the lower edge of the insulation. A butyl string can be used for sizing.
