YOU ARE BUYING A BRAND NEW NOS FACTORY OEM WATER PUMP.  THIS IS GM PART NUMBER 94360200 AND AC DELCO PART NUMBER 251-587.  THIS IS STILL IN THE FACTORY BOX.  SHOULD FIT ANY 1990-1991 GEO STORM AND SOME OTHER MODELS AND SOME ISUZUS.  THIS IS THE WATER PUMP ONLY, NO GASKETS.  THANKS FOR LOOKING.