This is a genuine AAM rear axle ABS tone ring that shows to fit 2007+ GM 1/2 ton trucks and SUV's with rear ABS. The part number 40030759 is on the rubber on the inside of the tone ring. These have 32 teeth, beware that some earlier models had 55 teeth, and they don't interchange. These go on the rear axles. There is 1 on either side.