Hi, I'm using Zen Cart version v1.3.9d, and the OZPost shipping module.
I am able to set up the default shipping dimensions in the OZPost module, however, it alludes to there being an option to override this with smaller or larger items...
I cannot find this option anywhere, even after extensive googling and reading the FAQs.

I know it is possible, as a cart that is very similar to mine has it working functionally (http://www.nopatience.org/store/ <- if you add a 7", it shows a smaller dimension on the estimate shipping page than if you add a 12").

If anyone knows how this is possible, I'd be very appreciative!

Thank you.