t-150 3 spd shifter knob

[tn trooper]

Hey guys, this may be a stupid question but I'm looking to buy a new shifter knob for my 3 spd tranny. Does anybody know the diameter of the threads and what size it is i'm looking to buy a hurst knob but I need the thread.

 

[tn trooper]

It's in a 1979 CJ7 .

 

[IOPort51]

3/8 - 16