https://www.oreillyauto.com/detail/...ug-number-zfr6f-11g-spark-plug/ngk6/6987

Good looking plug.

I have wondered in the past whether the V10 plug was better for a towing duty 5.9 V8
I have wondered in the past whether cylinders 7 and 8 on a 5.9 V8 need a different spec or design plug.