My tattered old heap came with a mixture of chrome, closed-end acorn style and plain open-end style lug nuts on all four wheels; a real mix and match. The previous owner(s) just used whatever he had on hand to replace a lost nut so I am looking into a whole new set of 20. I know the thread size is 1/2" x 20 and all mine are right-hand threads, so no issues there but ... 1) What type was standard on a 1967-1968 CJ5? 2) Was there a special type provided by an original equipment manufacturer? 2a) What did they look like? If open-end, were they plain steel, zinc plated or chromed? 3) Did they have a bevel on the base [and a specific bevel angle] to match the factory wheels? 4) Regardless of style, type and being period correct, is there any advantage to closed-end versus open-end? I'm currently running this kind of wheel v v and hope whatever lug nuts I end up with will play happily with OEM style steelies if I decide to go original.... All kinds of choices on that popular auction site, even black powder coated open-end or the most basic of types $10-$12 per 20.