1969 A Body (Barracuda) license bracket

At first look I interpreted Als post as "final result should show a tag/plate on it".
Nobody wears this tag bracket minus a tag.
Then I noticed there are still no bolts through holes attaching the top of the bracket. It might work that way. It might make noise from vibration too.
The slotted openings in the bracket are not meant for the bumpers ears to pass through. They are just wide open tolerance bolt holes. The holes in bumpers ears are also bolt holes. You still need 2 nuts and bolts.