I'm not sure why you're shopping for a battery at Home Depot, but that's beside the point! H7 is the correct size. The H8 is an inch longer, will fit, usually has more CCAs & may cost less, so shop them as well. Do you have a Walmart, Advance Auto, Autozone, NAPA or Pep Boys (usually carry Bosch) around you? Look for an online coupon before paying.
Who Really Makes It & When Did They Make It?
Most automotive batteries made in America are manufactured by one of two companies: Johnson Controls, Inc. or Exide Technologies. The dominant replacement market brand names, Interstate and DieHard, are both Johnson Controls products, as is the Optima brand. Exide Technologies markets batteries under the Exide, and NASCAR Select brand names, and has manufactured the Champion brand, as well. However, Champion batteries are now manufactured by Johnson Controls. The other large domestic battery manufacturer, Delphi Corporation, sold its automotive battery business to Johnson Controls in 2005.
Though a particular battery’s manufacturer can be identified though a manufacturer’s code number stamped into the battery’s case, here’s a short list of what’s made by whom:
Brand Manufacturer
ACDelco Johnson Controls
Advance Auto Johnson Controls
AutoCraft Johnson Controls
Autolite Exide
AutoZone Johnson Controls
Bosch Johnson Controls
Champion Johnson Controls
Costco Johnson Controls
Delco Johnson Controls
Delco-Remy Exide
DieHard Johnson Controls
Duralast Johnson Controls
Duralast Johnson Controls
Equalizer Johnson Controls
EverStart (Wal-Mart) Exide or Johnson Controls, depending on model
Firestone Johnson Controls
Interstate Johnson Controls
Marathon Exide
Motorcraft Johnson Controls
NAPA Exide
Optima Johnson Controls
Orbital Exide
Pep Boys Johnson Controls
Sears Exide or Johnson Controls, depending on model
Wal-Mart Exide or Johnson Controls, depending on model
There is also a date code showing when the battery was manufactured. This is usually on a sticker attached to the battery or stamped into its case. It is a letter/number code. The standard convention is that the letter is the month of manufacture, alphabetically A through M but omitting I, with A being January and M being December. The number is the last digit in the year of manufacture. So, C6 is March 2006.
There are, however, some exceptions to this nomenclature. On Delco batteries, the arrangement was reversed: year first, then month. Exide batteries often bury the month/year designation in a larger number, so it is usually the fourth and fifth characters in that number.
https://www.cartechbooks.com/techtips/battery/