Rear Drum brake size 180.0 or 203.0?
 

l have a Hyundai Accent 2003 1.6L LC manual.
I'm wanting to replace the rear brake drums and shoes, but wherever I look there seem to be two sizes 180.0 or 203.0
Does anyone know which my car is or where I could measure this?

Check carefully on the outside of the drum,, just above the bolt holes, many times the dimension is cast onto the drum.

It has cast into it max dia 205.3
I've measured the inside diameter of the unworn lip and it's 203mm so I'm thinking that's the right one.