E-Brake help please

Exactly right. The emergency brake hardware is based entirely on the diameter of the brakes. If you have 10" brakes on both rear axles all of the e-brake hardware should swap right over. The width of the brake pads doesn't matter, neither does BBP or SBP as long as you're just talking about the e-brake hardware. Or any of the self adjuster hardware for that matter.

The strut rod for the narrower brakes is different, they had to put a bend in it. the wider brake strut has no bend...