These ABS sensor spacers are what you needed for the old Version 1 Miatahubs if you want to use ABS. V2 ABS Hubs come with a spacer, so you do not need to buy these if you are getting the latest V2 Hubs. These are listed here only for those who have the older V1 hubs who may decide later to add an ABS tone ring and sensors to run ABS on their car, and therefore need this spacer.
Price is for a pair of spacers and bolts, enough for a pair of front hubs.