C-body 11in Drum to A-body 8 3/4 Questions

The 8.75 I'm working with I pulled from a 68 Newport parts car. On this particular car the breaks are 2.5" x 11". Now I'm not sure if other diameter sizes were available on C-Bodies, but I think these were more popular than the 2.75" x11" or 3" x 11" width.

I'm sure I can post some pix an post them tomorrow for you as I have not yet assembled the rear.