country squire
 

I just bought a rear brake hose for a 1987 Country Squire.
The outlets from the hose to the rear drums have 2 different brake nut thread sizes.
The outlet to the left drum is 10mm thread. the outlet to the right drum is unknown. It is bigger than 10 mm but smaller than 12mm.
I cant find a brake pipe nut in between.
Does anyone know the answer to this, and why the 2 different size threads on 1 hose.
Any help would be appreciated.