So i had time to look at my brakes and i took the front drums off and measured inside diameter and its 10". Correct me if I'm wrong but i thought 70 Dusters with 225 slant 6 are supposed to have 9"?
Standard would have been 9”. But there were option packages that would have triggered the 10” brake option. Or they could have just been an upgrade. If they were factory they should be on your build sheet or fender tag if you have either of those.
