The ABS sensors are located on the front driveshaft in the knuckle. You will see this thing sticking into the steering knuckle with a wire coming out of it into the firewall, then into the loom. In the rear they are just ouside of the diff and have the same type of sensor. The sit just off a disk have cutouts on the outside of them, that goes for the front and rear..
If the car originally functioned correctly with the ABS unit in the car, then the sensors should still be there.