The (side of the) square heads go into the square holes in the side on the tube (seen at about 10:00 and 6:00 in your picture)
The post (first picture) that has the web to the center goes in the notch hidden from view in the second picture.
The two pieces can really only go together one way, having the correct bolt will make a difference but may be tricky getting them to engage the housing with the column in the car, I had mine standing up and it was tricky.
It does appear that having the housing loose has caused damage to the square head pocket in the housing along with the hex head, a new housing is in order.
Alan
