Brandon, AKA Vin Guy can't help you on the '89 Caprice. GM deletes the VIN info when the car is about ten years old.
Check the SPID (Service Parts IDentification) label on the trunklid for a list of the RPO codes found on your car. The VIN can also be decoded to give more info. The stickers on the driver's door will tell you what month and year the car was built. You can also look for the build sheet usually hiding under one of the seats in the springs.