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Does any one know if you can buy the knob part and screw that attaches to the indicator turn thumb switch lever. My switch works fine just need the end, or is there a different bike that uses the same Nippon Denso switch gear without a Ducati price.

Those switches were common to a number of Suzukis. So your best bet is to go to a wrecker and get a switch assy that doesn't work but has the parts that you need.
Ian