As Fred says, you will need to get the key codes off of the door lock or ignition cylinder (for the square key) and the trunk lock or glove box lock (for the round key). Once you get those codes, I would recommend Jesser's Classic Keys in Akron OH, 330.376.8181 Not inexpensive, but I know of no one that does it better.
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Bill Pritchard
73 Camaro RS Z28, L82, M20, C60
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