Yes I have one ordered KL3Z10A687C but taking forever. I'm not sure what they do but must be needed as the manufacture would definitely not include it.60k is better than most. Mine only lasted ~15k. Good call on the larger non-OE battery. Also, you can get a larger battery blanket that will fit the new H8 battery if you choose.
I swapped out the H6 (after the usual problems) with an H8 Walmart. All is good now. I cut the H6 blanket and opened it to wrap (most) of the H8. 2021 5.0 XLTYes I have one ordered KL3Z10A687C but taking forever. I'm not sure what they do but must be needed as the manufacture would definitely not include it.