After a lot of time and work I sold my C4, never put these on. They won't work on anything else I have (maybe the MZ5) so if someone wants them I'll let them go.
(4) 17x9.5 et56
5x120.65
"Race" version so no caps
They aren't perfect and do have some nicks along the lips; they've been hanging out in my garage since I got them waiting for use.
$1700 shipped
Located between Detroit and Dayton, happy to put them in your hands anywhere between the two.