I know the 280zx calipers are not easy to find for the rear of an 82 Nissan/datson but those style calipers have a pretty good parking brake function as i understand it. I would guess you could find newer more available ones that have the same offset you need for the rotor(or you could add spacers to get it), and i am sure you could "adjust" the mounting bracket to have the right holes with correct threads. They are single piston calipers and they have a twist lock engagement style for the parking brake that i think you could easily leverage.