The hurst is 3/8 by 16 thread as noted below: I ordered the black one from Jegs - ths info is below. Don't know about the other brands.
https://www.jegs.com/webapp/wcs/stores/servlet/product_10001_10002_673938_-1
Hurst #530-163-0125
5-Speed Pattern, Black Ball, 3/8'' - 16 Thread...