Hey OE Parts Headquarters here and we have a coolant temperature sensor in stock for all 1996-2005 GT's. The link below should direct you to our site and display the part.

The coolant sensor is a 213-2148 $19.90

This is a genuine ACDelco part and has a one year warranty. Remember that all orders over $75 will ship for free and all others ship $6.99 for UPS ground.

Thanks
-OEHQ