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I believe that about 5% of V6's were manual. Most of those would have been S models.
I used to have one before the VE SV6. The Ecotech was a very good engine with a manual gearbox. Plenty of torque through the rev range made it an easy car to drive city or country.
Had a VS II V6 manual before the VY II. One of my sons still has the VS II.
Yea iv got one , nice car bloody love it. got it about 5 months ago no regrets
Here http://forums.justcommodores.com.au/vy-vz-wk-wl-v2/117392-my-red-vy-uterus.html
woodsy