Thread pattern on this shift knob?
 

I want to replace this T shift knob with a Hurst white Qball on my 69 Camaro SS. Anyone know the thread pattern on this shifter? It an older Hurst Munci shifter. I just bought the car so its not here for measurement.

I found two on the market 3/8 16 & 3/8 24 which one do you think fits this?

Attachment 26378

Easiest way to tell would be to grab a 3/8-16 and 3/8-24 nut form a hardware store and see which goes on.