2011 370z with body problems

Nevada3

Glad to see you easily fixed the side skirt. Two things to check on the rear bumper:

1) Look inside the trunk where the black bracket bolts connect to the sheet metal. It is possible one or more of the bolts isn't all the way in causing the bracket (and by extension the bumper) to sit a little further away from the rest of the body. It will be obvious if one of them isn't seated properly, they are either fully locked into place or they aren't locked into place. If all of the bolts are fully extended into the body and the trunk area, inspect the sheet metal immediately surrounding the bracket bolts. Sometimes the sheet metal can be bent outwards just where the bolt attaches to the body causing a similar affect seen in your photos.

2) If everything checks out above, check the positioning of the tail lamp. If the tail lamp is not fully pushed forwards (towards the drivers seat) the bottom of the tail lamp can prevent the bumper from seating properly and slightly push it out, similar to what you have going on. Check this as well.