Screw Holders

[olddman]

I took apart the headlight buckets on my 1965 Dart GT last week to clean up the grounding point and general cleaning. When I was installing the inner and outer trim rings a couple of the mounting screws would not tighten. The plastic insert that the screw screws into I guess is worn out. Can anyone tell me what these are called and where I can get some?

 

[Oldmanmopar]

Picture would help to get an answer.

 

[olddman]

Will take trim rings off and get best picture I can. Guess you might call the part a nylon nut that fits in the hole that headlight trim ring screw goes into.