The geometry is the same, the spindles are somewhat different. The C6 has reinforced areas around the brake bracket bosses. They are interchangeable with the C5.
Wilwood has two part numbers because they had to slightly move the rotor away from vehicle centerline because the LCA ball joint boss is larger than C5. Putting a C5 kit onto a C6 will have intereference between the ball joint boss and inside rotor face.
C6 parts are cheaper, too.
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Matt Jones
Mechanical Engineer
Art Morrison Enterprises
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