I know this post is really old but what did you guys find out? Did they make any N-96 1970 Dodge Challenger's in a convertible?
I could have swore that Roger Gibson restored a Hemi 70 convertible Challenger that was N-96. It's currently for sale at 450k. Cheap for a 1 of 9 USA built car.
Here is one of the nine, I was wrong it has the "two scoops raisin bran hood"!