Shifter Knob Thread Size

Can anyone tell me, off the top of your head, what size the threads are on the shifter knob in my truck?

im making a piston shifter knob and wondering the same thing. i did use a thread gauge to find out the thread pitch is 20 but im not sure of the size.

10MMX1.25MM CHECK OUT THIS SITE

Thanks man.

my happens to be 12mm x 1.50