I wanted to revive this thread since I just put JL Rubicon wheels on my TJ. My concern was, as mentioned above, the JL uses M14-1.5 (13/16" hex) wheel studs vice the 1/2-20 (3/4" hex) for the TJ. With the JL wheels using a larger diameter stud it also means the wheels have a larger hole for the lugs and finding an adapter with M14x1.5 studs that are hub-centric is about impossible unless you want to have them custom made for around $500.
What I did was purchase readily available hub-centric 5x4.5 to 5x5 adapters with 1/2" studs for
$60 a pair. I used the OEM lug nuts to check the fit. I felt that there wasn't enough of the conical portion of the lug contacting the wheel, so I put a little grease on the lug, hand tightened it, removed it and looked for grease marks. My feelings were confirmed.
I went on the hunt for larger lug nuts and found 1/2-20 (13/16" hex) lug nuts on Amazon. Purchased a set and took some measurements. The diameter of the conical portion of 3/4 hex lug nut measured 22.75 mm and the 13/16 hex lug nut measured 23.85 mm, plus the conical portion was noticeably larger or deeper (see picture). I installed one with the grease test and found that the entire wheel had lug nut contact. These will work just fine.
Here are the lug nuts I used:
https://www.amazon.com/gp/product/B07QM9WD6B/?tag=wranglerorg-20
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Finished product
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