FWIW, these come up as the control module and the actuator but you'd need to verify the correct part name and application with the seller. Tasca is a good online Ford parts source but it worries me that they list the same module from 1996 through 2003. I am reasonably certain that the 2001~2003 4WABS Module is different from previous years.
Anyway, I'd give them a call and talk to a rep before ordering. 1-800-915-3141.
Even if you somehow needed both parts (doubtful), the combined price is still way less than $900.