11" drums, what is the difference

Hey All,

Went to order hardware sets and adjuster hardware sets for my 11" rear drum brakes tonight. In the classic industries catalog it breaks the adjusters down into several different groups.

Self Adjuster hardware sets
B body
1965-69 (left and right)
1970-76 (left only)
E body
1971-72 (Left only)

Drum brake hardware sets
B body
1969-72 Charger (rear with 11")
1969-74 (front or rear with 11")
E body
1970-72 (front or rear with 11")

There must be a difference as there are a few different part #'s for these applications. Does anyone know how I can tell what year/model these 11" set ups I have came from?

Thanks,

CE