Sold as a set of four pads: two for each caliper, which is enough for both rear calipers.
Click here for the matching front brake pads.
I highly recommend only using matching brake pads. That is, if you need to replace your front pads and want to use a different type than the outgoing ones, you should replace all the pads with the same type, even if the rear pads are still okay.
Wear Sensors: These brake pads do accommodate the brake pad wear sensors.
2005-2012 V8 Vantage and DB9, rear