1972 duster power brake booster
It's no longer produced or available rebuilt (except by specialty rebuilders such as Booster Dewey) and uses the same standoff and reduction linkage as the later unit that you pictured; but the Doctor Diff unit is a viable replacement, especially in situations where the later large diameter booster won't physically fit, such as Hemi/big block swaps and early A installations.
And '67-'72 A bodies used the dual-diaphragm Midland/Ross booster.NO.....
The A body used a single diaphragm booster, not a dual.
The single looks like this:
View attachment 1716092486
The dual is for B body cars and looks like this:
This is a booster and MC from a 73-76 A body:
View attachment 1716092484
It has reduction linkage and a standoff bracket arrangement to clear the engine.
View attachment 1716092485
It's no longer produced or available rebuilt (except by specialty rebuilders such as Booster Dewey) and uses the same standoff and reduction linkage as the later unit that you pictured; but the Doctor Diff unit is a viable replacement, especially in situations where the later large diameter booster won't physically fit, such as Hemi/big block swaps and early A installations.