And, as an additional precaution, the brake drums from the Pinto 6-3/4" rear will not fit 8" Mustang II/Pinto rear. The bolt pattern is correct. The diameter of the brake area is correct, but the center hole is not big enough. Best to get a drum to drum 8" rear from a Mustang II or Pinto. And, unless there is something I don't know, they only came in 3:00, 3:40 and 3:55 ratios (from the factory).