What year and model brakes are these?

Killer6 said

The last year A-bodies had 2.75" pistons for '76, they are identical to the F-body & other slider calipers, probably because they gained so much freakin' weight by then. I
took a set off of this hulk I stripped for a few parts before donating it to My local Mopar Yard Guy..........
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Do you have some kind of factory documentation on that change?

I wouldn’t be surprised if it was true, ‘76 was the year that everything went disk up front so it’s totally possible the factory went with the same piston across the board too.

But finding a set of 2.75” piston calipers on one car 40+ years after it was built doesn’t mean it left the factory with them, and it certainly doesn’t prove that any other car did. The 2.75” piston bore calipers look just like the 2.6” calipers and they both use the same caliper brackets. The calipers are completely interchangeable, same with the brackets.