[Lee Stewart]

Hurst offered three different center cap designs. The standard cap was a flat, round chromed cap with the Hurst logo in the center. Available at extra cost was the chromed bullet-nose cap that had three Hurst logos or a chrome three-winged spinner with the Hurst logo in the center. A curved three-wing spinner was withdrawn from the market when safety and liability concerns for pedestrians were raised. All three of the caps were retained by two bolts from the rear, which prevented the caps from being stolen. Even the lug nuts were unique to the wheel, using a tapered mating surface. Lefthand thread nuts were identified by grooves machined across the flats of the hex.

https://www.motortrend.com/features/...r-hurst-wheel/