Here is a pic of a repro trim ring. The outer definition line is real soft (barely felt) on a repro ring. You can definitely feel it on a real ring. Farther inward is a concave 3/8s wide band that is deeper on the original trim rings.
When Mopar started with the 6.5 trim rings back in the mid 70s they kept the 1970 part #. If you find an NOS trim ring you ALWAYS have to measure it even if it has the 1970 part # sticker on it just to figure out if it is a 6.5 or a true 7.0 ring.