It could depend on the year but some wheels have 3 nubs and some wheels have four.
My 14” wheels all have 3 and I had some 15” wheels with four.
Pictured below, a 14x6” early ‘70s disc brake wheel with 3 nubs and some custom-built 17x8s that were built off of 15” centers with four nubs.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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