Genuine Bosch Spark Plugs X5 for Ford Focus RS Mk2 09-on, often used as an upgrade for the ST225. Fits all model years of ST225 and Mk2 RS.
Ford have now stopped selling the RS plugs and are supplying the ST plug instead. These are the Bosch Iridium Plugs that Ford were supplying.
Be careful of places telling you that they are selling RS plugs as they will almost certainly be the ST plugs.
Image shows the Bosch RS plug on the bottom compared to the original Ford RS plug top.