Chevelle power windows?

[X66 714]

30 plus years ago one of my friends bought a power window set up for his 1968 Chevelle 2 dr hardtop. He has since sold the car but still has the window set-up. He going to sell the set up but wants to make sure it is what it was said to be. There are numbers on all the arms but I don't know what they all mean. Most of the motors have 1967 dates codes. How can I tell what he has? Thank you, Joe