Which 8 3/4” SBP Drums and Hardware

As far as IDing the year, you can narrow it down by the vent/brake tee location-'69ish and earlier had it up on the center section, '70 and later had it further out on the axle tube.
All 8.75s had 10x1.75" brakes. Drum style changed through the years, but are all 10" and are all interchangeable.
The self-adjuster hardware changed in '69, but is again interchangeable (as a system). The later style is generally agreed to be the better of the two.