Need new license plate light...

[Architect]

I need to locate the rear license plate light housing... part number F8AZ 13550 AA ...It's just the cover with the lens in it...I haven't even checked with Ford yet...
Who do we go to for used parts (salvage)...?
Thanks, Architect

[Spectragod]

I have some, it is the same part on a Grand marquis and a Clown Vic, 2 7 mm headed screws hold it in place.