as tony said,
if you get a good price, buy both pieces.
you can always use the old cultivator frame and diggers to lay off rows or whatever,
plows, if they will not go in the ground, just flip them over and grind the the points down till you have a sharpe edge:
you want a sharpe edge and negitive draft, then they will suck in the ground, if not hang some weight on them.
unless you are plowing many acres, these old plows will do fine, then clean the wings good and oil/grease them down for next year.