Need to ID correct PS brackets for unique restoration

I'm trying to figure out what PS brackets, 2-groove WP pulley and 3-groove crank pulley were used on Scott Harvey's 4wd Aspen (The Cheetah) - built in 1975/76 with access to any MoPar parts. Figured maybe a truck application ? It's NOT the snow-plow option, it mounts above the WP. The brkts I need mount the PS about level with the driver's side valve cover - see pic of it's engine compartment. Any help is appreciated - I'm stumped so far.
Many Thanks,
Reed in Neb.