Those 205/55 16's should fit no problem. The Hydras were stock on later 7/9 turbo cars which have no mechanical differences. They will bolt right on.
The 225/55 16's might be a little wider and/or taller than you want, could lead to fit issues and definitely will affect gearing and speedometer reading.
Difference in the width of the rim itself is no problem, within the reasonable range, as long as you put tires on them that have the same overall circumference, and aren't so wide that they rub in the fenders. I think people have gotten away with a lot more than 225. But if you're using a tire that is taller in addition to being wider, might run into trouble.
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