68-72 SBP 10" Drum Emergency Brake Compoments

The cables probably are. I used the cables that came with my /6 - 9" drums with the 10" on a 8.75 rear.

Levers and hardware - probably not. Best check the factory parts book to see if the numbers are the same betrween the different diameter shoes.
Also keep in mind the shoes, adjusters, and automatic adjuster hardware changed for model 1969. Emergency brake lever AFAIK did not change. I converted to '69 style adjusters and kept the same emergency brake hardware.