I have a question. I have a 74 satellite and need a fuel tank. In rock auto the fuel tanks are different between the 73 and 74 years and $100 more expensive in 74.

The cars are basically the same so I’m wondering why the difference? Emissions?

The parts numbers are the same for 73 chargers and satellite as well

Then in 74 there is a large hump on top of the 74 for both ?

I talked to a guy who’s using a 73 tank in his 74 but I’m curious on what’s different ? Any ideas