BMW: Windows no workie

1992 525i - M50. The other day it rained like 8 inches in an hour in
Columbus. I was driving home and found myself surrounded by flooded streets.
I took the path of least resistance and avoided all the smaller cars
floating by. I got home and noticed I had some water on the floor behind my
drivers seat. The next morning I noticed I could not roll the windows up or
down and the interior light would come on and go off. I pulled the rear seat
out and had about an inch of water under the power distribution box (rear
drivers side). I cleaned it up and I noticed that the green relay box had a
crack in it (General module), but I could not seem to get it out. Now I
can't roll down the windows, No power roof, and no interior lights. Can
someone tell me where I can purchase another relay module, and how do I get
it out?

Thanks!