fix for lower quarter panel rust

thanks guys, good info. My 73 Duster quarters are loaded with bondo so the rear panel replacement will be the way to go. The 75 Duster I bought for parts was from Arizona and as it turns is amazingly solid even though it endured some New England winters. The only rust on the lower quarters is below the lowest body line which leaves about six inches needing replacement. Since this car is only a 6 Cyl. I want to put as little cash into it as possible. Any quick fixes for that lower 6"x30"' piece?