9 or 10?

I want to replace my rear brakes and keep running across a confusion of the drums being 9 or 10 inch.
I'll pull one if needed, but does anyone know for sure if a 73 LH23 Dart Swinger 2 door hard top is 9 or 10?
It has the original 7.25 with 4.5 bolt pattern, and factory fron discs.

Thanks