I was really happy to see Oracle come up with surface mount Halos for my Challenger.
But, one happy note; and one complaint not resolved By Oracle Customer Service.

Happy: that I didn't need to crack open the headlight assemblies.

That 2 of the 4 rings came loose on at least one end.
Actually the Halo size is just a smidgen smaller in circumference than it should be for my Challenger.
So, after really good cleaning and surface prep with adhesion promoter, I slightly bent the ring outwards for a more peripheral placement.
Apparently the adhesive film isn't very aggressive.

After calling Oracle, the tech merely suggested a two part Epoxy re-glue!