I replaced my motors with Aerostar motors. To do this right, you need to remove the assembly, then do some cutting on the big rectangular bracket. The article on Mike's site is pretty good.
You can use almost any window motor you want. Another possibility is the Ford F250. It has a larger motor, and since you've got to cut anyway, there shouldn't be much difference with it fitting. The larger motor may work better, but I've got no complaints with my motors.
The Aerostar motor is more rectangular than the F250. The only real problem with clearance is the door hinge. Like I said, you've got to cut the bracket anyway, but once you do, the motor gets real close to the door hinge. If you place it right, or if you use the Aerostar motors, it will fit okay.
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