Chrome Spark Plug HolderA chrome-plated replica of the spark plug holder found on early Panheads, updated to accept even late-model Shovelhead deep-reach plugsMetal holder clamps onto the rear frame tube behind the oil tank on all Big Twin models and holds two extra spark plugs (not supplied)Held in place by a thumbscrewProduct Name: Caddy Type: Spark Plug Color/Finish: Chrome Units: Each Material: Steel