Locking Lugs on 1991 Pontiac Trans Sport

how can I get a key for locking lugs. Was told by local Pontiac dealer that it was a "luck of the draw" to get the correct key if ordered

Replacing lost wheel lock keys can be quite difficult. It may be easier in the long run to have the old wheel locks removed from your 1991 Pontiac Trans Sport and new ones installed.
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when it comes to wheel keys. the best thing to do is get a socket that is slightly smaller than the lug nut and tap it on with a hammer. Place an air inpact wrinch on that socket and turn the locked nut off from the outside of the lock rather than the inside. If it's done properly, that lock will come off in a matter of seconds. Good luck