Welcome to the Forum from NH.
Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.
I hope that you will become a participating member in the Forum's discussions.
Pics, please.
Would a review of the VIN number provide any guidance on whether parts lean toward 1999 or 2000? I know that when I am looking to confirm a correct replacement part number, I call the local dealer and give them my VIN number, and they give me the correct GM part number. Then, I go shopping for the best price for that GM part.