I have an ongoing need for ABS axle reluctors - the toothed wheels that are pressed on to the axle flange near the wheel bearing. When I sell a axle set for a TCS car it helps to be able to ship them with the reluctors installed. GM doesn't sell them separately and I haven't found a source other than used takeoffs.
If you have a TCS car that has ABS disabled (CMC, drag racers for example) then the reluctors are just extra weight on your axles. Make me a deal for them.