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In addition to what yellowbrickroadster says, which is a good description, you should know that the motor shaft housing is very thoroughly sealed to the firewall.
The shaft housing actually reaches through the firewall, through the air channel (about 2 inches) and a bit into the cabin. On the cabin end it fits through a grommet which, on installation of the shaft, wants to roll and get ruined. Lube it with a drop or two of ATF.
In the engine bay, where the motor seals to the firewall, there is a significant amont of rope caulk. That's the black sticky stuff that is an excellent caulk and clothing stainer. Hard to get loose, get off, and replace. When I replaced the wiper motor on my 1986 I bought a box of rope caulk at a NAPA store, used about 10% of it. BTW, there might be a ground connection strap hidden under the caulking.
In your situation, I would look very carefully at making a cut in the new padding right below the wiper motor location, and working at installing the pad without removing the motor. Rather like the way a bathroom flooring or carpet is cut to fit around the toilet.
The cut would be located so that after installation it could be glued and sealed to prevent any leakage. A cut along the bottom of the hole might not be the best location. Maybe one from the driver's side upper corner and angling down to the bottom edge could be better sealed and glued. Fewer leaves there, IIRC.
Good Luck,
Bob
:>)
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