At one time, I had 6 Challenger fenders here;

The original set for my T/A.

1 NOS 1970 fender.

1 used 1970 fender from a 1970 /6 car.

2 original fenders from my 1971 318 Challenger.

The upper lips were identical on all of them.

As far as the fender well chrome goes, it was not available on the 1970 Challengers with a 340, (T/As & A66 cars). Lots of folks seam to like them enough to add them though.