Rear shackles were stamped steel with darkened studs and an oil coating. Repro's are pretty nice and cheap.
Leaf springs were oil quenched, so have a very dark appearance and also with an oil coating. The clamps are stamped steel, so there would be a contrast. Rubber insulators on the clamps would not be painted, just regular black rubber.
Driveshaft was also made from sheet steel, so the tube would be a little lighter than the cast ends.
Of course, if you're not concerned about this level of detail, cast blast paint is fine for all of the items you listed.