Custom keys?

[mr48chev]

Back in the 50's and 60's the key makers and lock smith shops often had upgraded blanks (for lack of a better term) that you could buy and have cut for your car.

This is just for example and I wouldn't suggest buying it as it's unknown as to what it fits.
http://www.ebay.com/itm/VINTAGE-GOLD...item19d26ed36a

They are still floating around and you still see them on the displays where they make keys in some places. You do have to find the right blank though.