A-body 8-3/4 drums

I’m not above admitting I’m wrong. Too dark to look under both 69s I have, maybe tomorrow, both are 9” 7-1/4s. If only 3 years I imagine they’re hard to find.
'66 to '72, so 7 years used the same 10" brakes on both 7 1/4 and 8 3/4 rear ends. Even real late '65's had them.