Number plate change - rear bracket / facade?

[LloydV]

I have just changed over my front number plate and removed the plinth that it was on all very easily - then it came to the rear... as im putting on new plates as the old front one was badly cracked and the rear one has a garage's branding on it. The plates are a different size... so im thinking I have to remove the bracket that was holding the old plate (top pic). Then the issue is that the new plate shows the hole behind more (bottom pic), is there a simple fix for this like a facade that will fit neatly in there? I obviously want it to look nice and tidy.

 

[StevoD]

Isnt that rear plate for a 4x4?