I checked the AutoZone battery, and contrary to what they say, it won't work in a 2000+ Bonneville. It'* about the right size, but it lacks the top vents that we need. Plus, we require a Group 79...it'* a Group 78. Close, but not quite.
The good news is that I did find the correct aftermarket battery from Sears. The DieHard International 3379 is an exact fit. It has the top vents, 800 CCA, and an 8 year warranty with 3 year free replacement. Cost is $99.99.
I bought one, and it works fine.
Y2K Midnight Blue SSEi
White Cathodes in Grille/ Blue Cathodes Under Seats