I would think from the automotive world : 12mm thread , 4 wire , narrow band O2 sensor . I have my old removed ones I would give you .
Apparently Harley have gone to 12mm thread now , my 2009 HD is a 18mm . Can also use a thread adapter I suppose. But this link show a Harley , 12mm Thread , 4 wire O2 sensor. You will have to change out the connector plug :
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