It's not in the AIM, there's no GM part number on it (which it should have it if were factory installed), and I've never seen one of these on an original car, so I'm going to say no. Granted, I've not had a chance to see a lot of cars with original batteries over the years, but I'm still going to say no!
Edit:
But of course, they have them listed on
EBAY, so it
MUST be real!!!
Ed