GMC 1997 Safari Owner's Manual page 77

This vehicle has one
double-sided key for the
ignition and door locks. It
will fit with either side up.
When a new vehicle is delivered, the dealer provides the
owner with a pair of identical keys and a bar-coded tag.
The bar-coded tag has a code on it that tells your dealer
3r a qualified locksmith how to make extra keys. Keep
chis tag in a safe place. If you lose your keys, you'll be
lble to have new ones made easily using this tag.
NOTICE:
Your vehicle has a number of new features that
can help prevent theft. But you can have a lot
of trouble getting into your vehicle if you ever
lock your keys inside. You may even have to
damage your vehicle to get in. So be sure you
have extra keys.