Classic round Hurst logo shift knob as found in discontinued retail #1631402:

• 1 7/8" round ball of colored thermoset resin, polished
• SMALL size for classic Hurst shifters; NOT the larger 2 1/8" some expect!
• Hurst logo (lapel pin) embedded within a clear layer of cast resin on top
• Plain sides, no logo
• Recessed brass mount configured with 7/16"-20 thread for use with most Hurst Quarter Stick automatic shifters
  
• This listing is only for 7/16"-20; OTHER thread sizes ARE available BUT only via our website!
  
• Jam nut of specified size included
• WARNING: jam nut MUST be used; knob will break if mounted w/o nut!

Regardless of your application, confirm thread size BEFORE purchase. NOT RESPONSIBLE for wrong thread size!