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Guessing that F55 will not be standard on the base C7.....
The rear crossmember looks to be quite a departure from the existing design and it appears that it may be magnesium?????? from the coloring vs the A-Arm. But then the A-arms might also be magnesium.
At the same time there are enough differences in the suspension, that GM has scheduled a special C7 Suspension Seminar at the Birthday Bash at the National Corvette Museum.