NOS 1979 300 R/L Fender Louvers #4022852, #4022853
I ordered these years ago and am posting pictures so you can see the differences
The plastic part is the same it is just that the clips are mounted differently.
Some (but not all) have a green or red marking on the back so I assume they could tell them apart.
A small number of them have the fake exhaust ports painted black
A few have paint overspray on the clips
There are 2 different colors : bright white or a darker (slightly tan)...
NOS 1979 300 R/L Fender Louvers #4022852, #4022853