This is what I put in mine. It's a little larger than stock, but fits just fine.
https://www.interstatebatteries.com/products/mtx-49/h8
https://www.interstatebatteries.com/products/mtx-49/h8
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That's an eye-watering price but it's supposed to be the ultimate, so...
Walmart has a re-branded version of that Autocraft battery, both are made by Johnson Controls. They appear identical, including the "Made in Germany" sticker. The NeverStart version is priced at $150 plus core, which is the lowest price I know of for any Group 49/H8 AGM. And, as a bonus it claims to have a 5-year free replacement warranty. The AutoCraft is $197 but you may be able to get a 20-25% off coupon. But it still only has a 3-year warranty.