What is the size of my shifter's threads? I'm looking at shift ***** and they say they will fit 12mm x 1.75 or 1/2 - 16 or something and that doesn't help me know if it will fit my 1993 z-28 with the 6-speed. I really want a T-handle but can't find one at checker to fit. I had to return three today and they told me to go figure out my shifter's thread size before I come back.

 

The stock shift lever has 16mm threads. Not sure if they are 16mm - 1.25 or 16mm -1.5, but its one of those.