'72 Dart: How to remove fender splash shield?

If it has a metal splash shield there are a series of bolts accessable from the rear of the front wheel opening.

If the car has undercoat they might be hard to see.

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So the bolts for from the inside of the fender well back toward the car, right? But are likely hidden by undercoating?

That would explain it. I found one in a local salvage yard that I believe will fit, but I couldn't see the bolts. Thanks!