You are buying a set of 4 spark plugs to suit.
E7RA-11 the exact equivalent fit to NGK BCPR6E-11
Splitfire Spark Plugs exceed OEM quality and are precision engineered to give you 100% spark performance in all conditions.
Note that these spark plugs are conventional single electrode design. Splitfire also make high performance or racing spark plugs with two electrodes for even more sparking power. These feature the unique split electrode similar to a snakes tongue. This gives the spark even more places to travel ensuring full combustion and potentially more power.
Splitfire peak spark Plugs feature: