Sears did not actually have the battery so I could not measure it, but you are right, one needs to physically check it out and measure it.
Autozone is everywhere and easy to work with so I will try them in person.
You may laugh at this: I clicked on the Autozone link you provided. Since I had previously been at their website, my TBird is stored in some cookie or something. As soon as your battery link came up, so did DOES NOT FIT
Now you know why I am paying close attention to the details!