Originally Posted by DirtKar
You can just pull the lock assembly out of one of your doors and take it to a regular locksmith. $12-15 (+ or -) later you have a key that fits the doors. This is assuming the doors are in fact a pair from the same vehicle.
True that ^
Pre-91 doors use a single edge key similar to those used in old Chevys, and a different key for the ignition. Both the size and shape of the holes in the different year doors are different too (meaning you can't drop a later cylinder into an early door and vice versa - believe me, I once tried).
My '89 has the original hard doors, but it didn't come to me with door keys, only one very worn and cracked ignition key. A local locksmith was able to whip up new keys in less than 20 minutes (it was a slow day I guess) for under $20. Worth every penny, since I didn't even have a blank for the door key.