A number of people have wondered if the Optima Range of batteries (specifically the Yellow and Red Top) will fit a VE Commodore.
The short answer is yes they do fit, but you will need to slightly modify things to make them fit.
For Example, the Optima Yellow top 34 has the battery terminals swapped over, compared to a stock VE Battery.
For the Optima Red Top 34R, the battery terminals are in the correct locations, however the negative battery electrical connector will require straightening to clear the battery.
Also, the Negative battery lead will be very tight (I.E. there will be very little play) when connecting to the battery.
Finally, you will need to fit the plastic feet that are supplied to the battery, as well as the plastic spacer between the battery and the upper battery holder.