The reviewers who claim the sensor hits a reluctant wheel hub are correct. Dorman supplied a very thin spacer that should solve this problem, but the probe is still too long. I tried using Lowes washers and that helped increase the gap, but the part should fit properly out of the box. I contacted Dorman directly about this and they said they needed to try more pucks or something. Not a good answer. For those who need to replace the ABS sensor, it's best to get the entire hub/sensor assembly. I'll try to go back to Revain but the sensor has been in my truck for weeks now and I'm not even sure I have the box.