Wolf.Dose

The WR7AC is a coding for the type of the spark plug used only by Bosch. 7 the the heat range, the last C is for Copper core. The classical destination is a W175 T1, were T1 stands for the tread length, 175 is the heat value. So it is just a classical spark plug. And most of the civilian american plugs are also metric. The treat is M14.
Wolf