Go aftermarket; Genuine and you would need a body ECU (say $900), certification ECU (around $400), steering column lock (probably $200), start switch (over $300), wire harness (getting expensive now), engine room fuse box (expense continues), keyfobs ($600 pair) and much more! Prices are only estimates, I haven't looked at prices for these parts in over 2 years. I have my facelift ZR6 up for sale if you want to go genuine ...