Ground effects for 1973 Plymouth Satellite?

[PERoss73Sat]

Rolling in and out from underneath my Sebring Plus I can see a couple retainers sticking through holes and more holes that look to be missing retainers. The outline in the paint follows the retainer holes. Has anyone seen this vintage of Plymouth Satellite with some sort of plastic ground effect under the front lip?

 

[Fran Blacker]

License plate holes?

 

[RR Fan Dan]

License plate

 

[roadrunnerh]

Or might be for a bracket that holds the front plate?