Onstar antenna threads???

[03GMC2500HD]

Does anyone positively know what the threads are for the 3" Onstar antennas? I have tried standard #10-24 (to small) #12 (not right) metric 5M-.8 pitch (too small) 6M-1.0 pitch (close but not right) Anyone know what it is for sure?

 

I turned a matching billet antenna for it but need to find the right threads before drilling/tapping it. Better yet does anyone know if anyone makes a billet Onstar antenna. I thought I saw one in a catalog a few months back but cant find it anywhere. thanks!

[mark w]

stylin concepts

 

[03GMC2500HD]

Thanks, I knew Stylin Concepts is the catalog I saw it in but could never find it in there again. i even searched their website not too long ago and could never find it. i think the 6M will work for the antenna I made and if it doesn't I can alway but that one. Free is better than $30 for a 3" antenna though! Thanks!