Here's pictures of the shifter numbers. I can shoot a couple more pictures of both shifter as I have them on the bench right now.
From what I have read, GM purchased the shifter from Hurst but used GM plain shifter handles. You can also use a Hurst Super Competition shifter.
You can send your shifter to Hurst for rebuild. Kind of pricey considering that the parts kit is reasonable & the video makes it look easy.
http://www.hurst-shifters.com/shifter-rebuild-program/
https://www.youtube.com/watch?v=huUETRzXM7k