So I bought my car knowing I would have to do a little rear end body work as the previous driver backed into a corner or pole of some sort. The bumper didnt crack, but bent in at the point of contact. The bumper reinforcement which looks different than the replacement parts (IDK why) is crushed in where the presumed pole was.. I have bought the following and want to know if I am missing anything important for mounting up the new cover that just arrrived in the mail.

Bumper cover
Left stay
Right stay
The cover that connects to the reinforcement
stock foam energy piece (that survived the bump) that connects to the cover above.

Anything else come to mind?

Thanks..