Thanks guys for the detailed information, especially to you Jack.
After reading what you said, I do have a problem with the left front hub. I have to use two large washers to space the caliper bracket properly, otherwise the bracket will hit the rotor. I have no idea why it's like that. But the washers I use space it perfectly, according to my eyeballs.
Sounds like you have a mixture of early 99 and late 99 hub and rotor.
in late march of 99 Ford added abs to the front. That required a thicker hub flange, and for that reason the rotor hat face became Thinner. It sounds like you have a late 99 rotor on an early 99 wheel bearing hub. the washers are making up the thickness of the late 99 flange.