Not sure what the "hump" is about but 70-72 fenders were more "flat" on the inside framing, 73 up had provisions for the fender to core support brace bars, the core supports changed for 73 up also. there may be other differences in the inner frame shape but the fenders themselves are the same dimensions & fit. what is specific to 71 is the rectangle vents on the lower sides.
Probably cheaper & easier to pay shipping for whatever you buy, 600 mile each way would be close to or more in gas than shipping, plus your time to drive 20+ hours round trip.
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