The champion copper plus spark plug for harley davidson xlch 1000 1972-1978 is part of the latest collection from champion.Features: features a copper core center electrode that allows for accurate control of heat range, optimizing performance and longevity of the spark plug patented sac-9 semi-conductor resistor for maximum emi and rfi suppression patented ultrasealâ coated shell for rust prevention8 per box, sold each.Specifications: center electrode projection: non-projected center electrode type: standard electrode tip material: nickel alloy ground electrode configuration: single ground electrode shape: standard heat range: 8 hex size imperial: 11 16 hex size metric: 17.5 Mm hex size: 17.5 Mm 11 16 model: rh8c product name: spark plug research value: finalized to fit: harley davidson xlch 1000 1972 sportster all models harley davidson xlch 1000 1973 sportster all models harley davidson xlch 1000 1974 sportster all models harley davidson xlch 1000 1975 sportster all models harley davidson xlch 1000 1976 sportster all models harley davidson xlch 1000 1977 sportster all models harley davidson xlch 1000 1978 sportster all models harley davidson xlch 900 1958 sportster all models harley davidson xlch 900 1959 sportster all models harley davidson xlch 900 1960 sportster all models harley davidson xlch 900 1961 sportster all models harley davidson xlch 900 1962 sportster all models harley davidson xlch 900 1963 sportster all models harley davidson xlch 900 1964 sportster all...