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Difference in spark plug body above the threads.
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[URL=https://www.ducatiforum.co.uk/gallery/photos/spark-plugs-turned-down-socket.6897/][IMG]https://www.ducatiforum.co.uk/data/photos/l/7/7719-1491084220-dc2f5f11a20f50deda23e297ea8d311b.jpg[/IMG][/URL] [URL=https://www.ducatiforum.co.uk/gallery/photos/spark-plugs-turned-down-socket.6897/]Spark plugs + turned down socket[/URL] by [URL=https://www.ducatiforum.co.uk/gallery/authors/esbee.38432/]Esbee[/URL] on Ducati Forum