Back Seat interchange

The 71 4-dr seat has rounded corners. Green
The 73 2-dr has square corners. blue
I have to unload the Valiant and check the fit but it looks like the 73 seat should work.
I just want to be sure the when I order 68 Valiant covers that they fit the 73 bottom.
Anyone have a 67-69 Valiant 2-dr that can help?

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