DRAG SPECIALTIES Spark Plugs — 12 mm thread, 19.1 mm reach, 16 mm hex, BPR4ES-11 – 74-86 Big Twin, 79-85 Touring, 82-91, 93-94 FXR, 84 Police
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Black ceramic-body spark plugs with a 95% alumina insulator, multi-rib flashover protection, nickel-plated housing, and copper core electrode.