ZOTAC Zotac GTX660 GTX660TI GTX670 Destroyer Fan PLA09215S12HIf you need a pair of fans, please take a photo of A+D or B+C directly to form a complete pair, otherwise the interface between the two fans will not be common., Please check the number of fan blades and interface for a single purchase(Variable mouth and standard mouth)For different types of, there are red circles in the detailed pictures describing the interface pictures. If you don’t understand, you can directly send pictures for consultation before taking pictures.