'68 Dart Passenger Fender Antenna Mounting

Howdy everyone! Been a long time since I've been on here, but it's good to be back. I purchased a '68 Dart 270 this past January and so far have really been enjoying it. I was at a local cruise in and I noticed a difference between the way my radio antenna mounts to my fender and pretty much the way every other 67-9 dart antenna mounts.

My antenna mounting location on the fender isn't flat like on every other car. Mine is kind of dished. I'll attach a picture so you can see what I mean. It causes my antenna to sit crooked and tilt inward towards the hood rather than stand straight up.

I know my car was in at least one good wreck before I bought it, so unfortunately I'm pretty sure that fender is not original to the car.

I've had some people tell me this is how ALL replacement fenders came back in the 80's from Chrysler, but that doesn't sit right with me. I crawled around under the car and found some rubber stamped numbers as well as the marking "N8" written in grease pencil. Are these factory numbers?

Any ideas?

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