Help! SBP to BBP and need help finding BBP Drums

The only ones that are narrower than the 10 X 2 1/2" common stuff is the 10 X 1 3/4" brakes that came on the '66-70 B-body 6 cylinder cars. Good luck finding them! Do yourself a favor and swap over to the 10 X 2 1/2" brakes.