Well the VC-160 Auto Drive spanned a number of years, startin in 72, and running right till 79, it went firstly under the name 'VC-160 Auto Drive' then later 'VC-Auto Drive' and eventually it was dropped down to just 'Auto Drive' though it maintained the same style (With a few colour changes) right throuout that time.
It did have 3 changes to the gearbox the Auto Drive MKI Gear Box, the Auto Drive MKII Gear Box, and the Modified Autodrive MKII Gearbox.
The Modified MKII was also applied to the Power Plus Self Propelled Models