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Ok, found the box. I got these with a bunch of parts in a truck I bought.
They are shown on the invoice as 1980-85 Eldorado calipers, left and right rear calipers. I did not remove them from their packaging, but they are used--I assume rebuildable cores.
The guy paid $105 plus shipping for them, from Cadillac Auto Recycling in Rancho Cordova, Ca.
I'll ship them to you for $100
The 76-78 have a larger piston and rotor thickness. You can use rotors from the front of the k5 with those.
The 79-85 are just a little smaller and require a thinner brake rotor. I'd have to measure the thickness to know the difference, but the 79-85 can be used with 12bolt rear ends and the 76-78 are used with the 3/4 and 1 ton rear ends.
Someone feel free to correct me if I got any of the details wrong. Thanks for checking though!