I've looked into this DieHard (AGM) battery; does require a small bit of edge triming off off the left and right side of the battery tray. Always been a DieHard fan, also use Optima Red as well.
This is now available in Group 96R, just a tad smaller and should be in a drop in replacement for the original Group 42.
https://shop.advanceautoparts.com/p/diehard...?source=certona