Ames VS Year One quarter skins
 

How do they compare? Is there really only one manufacturer of these things out there? It looks like the YO panel has the lense cutout, but you have to cut it on the Ames part. I'm more worried about how they fit and look.

I've done business with both companies and they both get a A-1 rating from me...

I doubt there are two different companies making them.

The businesses get an A1 or the quarter panels do?

I show Ames stating J185L+R for 68 GTO and 69 Lemans and the J185AL+AR for GTO only and the only different is the side marker. What do Year One state is the different?

Here's the Year One product: https://www.yearone.com/Product/1964-72-gto/kq568lhrh

Looks like they have one panel for both years, and you cut out for the proper marker light.

Year one is okay, but I usually find everything I want/need from AMES. I think the AMES boys just have better knowledge and experience with Classic Pontiacs.