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What is the D-Ring for and What Size Driver?

449 5
Hi All

There is a plastic panel at the front of the boot that I need to get off in order to fit my rear view camera.

However two of the bolts securing it are too tight to free and they also have a mysterious D ring. See pic. So...

1. What is the D-Ring for and
2. What driver shape/size do I need to free this bolt?
3. Are they supposed to be really tight?