You bought the same ones. The hub and inner valves are covered and won't rust. The surface where the holes/slots are will, just like any other rotor when it sits and gets wet. I sprayed all 4 with high temp clear VHT and they still look great. The pic above is not a very good one. The edges that look like rust is actually the outer and inner edge where the rear pads do not make contact. The difference is the VHT paint, not rust. I agree it does look like rust from that angle though. I need to get off my but and take some new pics without the wheels. Here's a shot of a front one from the gallery the same day.