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Does anyone know what the correct thread size is for the rear lug studs and nuts? I have the HD part number 10100071 and the old part number 83329-09 , but unfortunately the two dealerships that I contacted didn’t have any in stock and, they didn’t offer to order any in. Looking at the OEM parts breakdown they are listed as NOT available online and they are priced at $4.08 each. Checked eBay and the ones I found listed were priced @ $10 each plus shipping.
One guy in the service department said that they were 7/16-14 x1 threads but my lug nut look more like fine threads than coarse threads.
I do know that they are bulge type lugs.
And I used a 3/4” 6 point socket
Couple other things you may want to consider. While a 3/4" will work with the oem lug nuts they are actually 19mm and over time the 3/4" can round down the sharp corners. The oem lug nuts are not one piece but are capped. I much prefer a solid one piece lug nut which is what was recommended in one of the replies. Pretty sure the aftermarket lug nuts can be purchased in either 3/4" or 19mm - whichever you prefer.