10" or 11" Rear Drum Brakes?

I am switching my Duster over to use large bolt pattern (lbp) wheels from the small bolt pattern (sbp).

I am going to keep the Kelsey Hayes front disc brakes but use the Mustang rotors for the bolt pattern.

My question switching the rear brakes...should I go with the 10" or 11" b-body drum brakes?

Or does size really matter?

How is parts availability for both?

Thanks in advance.
Paul


Hello Paul... what year mustang rotors did you use to to get the 4.5 bolt pattern for the duster... im in the same situation i really dont wanna change the kelsey hays calipers for right now but i would love to up grade to the bigger bolt pattern

Thanks Rich...