For '04-'09 RSVR, RSVR Factory, '06-'10 Tuono, '00-'03 Falco, '02-'05 Tuono, '98-'03 Mille, Mille-R
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This is the longer, center plug, spark plug cap.
For a more affordable replacement, you may want to consider AF1 Racing's Replacement Spark Plug Wire Kit, seen on the RH margin of this page.
NGK part number VD05EM