Mopar Muscle Association UK

Hi all,
When measuring rear brake drums to get the diameter, do you measure from the front of the drum where the wheel studs poke through or from the back ?
Need new brake shoes and not sure which size drums I have.
It’s a ‘68 Charger with 383 and 727 auto
TIA

inside,where the linings sit,usually 10x 2.5"

Thanks Dave