Looks like earlier pin style B body stuff. Era 69-70 ish.
Good luck
They look like the Kelsey Hayes calipers on my E body.
I'm no expert but they look like my 73 on up A Body big bolt setup I have.
I'll mic the spindle in a little bitIf the rotors are one piece and one inch thick then they are 73 up B, A, E,F body pieces. The pin type caliper brackets are B,E, body pieces. The inner spindle bearing diameter should be 1 3/8 " to fit the above rotors. The calipers are 1970 to around 1974 B,E body. They also made these rotors in 11 3/4 ".