I am trying to get smart on trim rings, but it looks like there are a lot of variations.

I have these 15" by 2 1/2" rings. Are these originals? What about the different shaped holes for the air valve. I have seen round, egg shaped, Oval, large and small. Is there a reference for these anywhere? Most of the information I have found is older.

Also, for the Rallye (Class 1) Wheels, there is old post that talk about 15x 6.5" Wide wheels, but the parts book only discusses 15x6 and 15x7? Was there variations here too? Pictures attached. thanks