sometimes a dealer can cut a key by using the vin...i think that it may only apply to 88 and up vehicles, but wouldn't hurt to ask,
i had 1 made that way for a 92 astro van that had setup over a yr and was given to me that ran, but they had lost key, i only wanted the 4.3 out of it, but i spent $20, had the key made and drove it home!