Unique Lug Nuts for SS1 Wheel

[O's_Car]

I am looking to replace the lug nuts for the SSIs on my ’70 Cutlass S – they’re the capped ones and have gotten pretty beat-up over the years. Lots of parts dealers offer them, but I’ve seen a few dealers (Fusick for one) list a different nut specifically for SSIs – it’s solid chrome with a spherical head, not a flattened head like the capped ones. I’ve not seen spherical head lug nuts used on SuperStock wheels – does anybody have any info on them?

My Assembly Manual shows only one lug nut for A-Body custom wheels (part #399683 – I assume this is the capped nut), so I’m curious where this other nut comes from.

[marcar1993]

All that matters is the thread, the depth, and the "seat" of the nut(taper were it contacts the wheel). If the thread is right, and it's deep enough to hold the stud, and it will seat on the rim properly, it will work.

[O's_Car]

I was thinking in more of an historical context: did all SSIs come from the factory with the spherical head lug nuts? That’s what the Fusick catalog seems to indicate. If so, why do so many SSIs seen today have the capped nuts? The spherical head nuts are twice the price of the capped ones, could that be it?

I haven’t seen many ’69-’72 Cutlasses with SSI wheels in person recently, so my only reference is pictures on the internet or on TV (those Mecum Auto Auctions on HDTheater make a good reference). From what I can tell most SSIs have the capped lug nuts like mine. Anybody out there have the spherical head nuts on their wheels?