Quoted from cooked71:
Read somewhere Gomez said it’s also included with the LE as an extra in the coin box. They loved it also, but couldn’t fit it on.
Gomez said this during Coast2Coast interview. Prem/LE receive these plastics with mounting hardware in the coin box. They thought it wasn't a nice fix next to the molded figures. But if you do like it yourself you can install them.