Hi all have a 2004 envoy 4WD and amber ABS light came on did some t/s and found and open on the LEFT front wheel speed sensor has anyone ever replaced a sensor ? I have a question about the R&R it appears to have one allen screw and a rivet on the hub retaining the sensor . Does the new unit come with it ? when replacing the unit do u just drill out the rivet and install a pop rivet in it's place ?