Changing 12v battery from group H7 to H8

[yettavr6]

Well, this is big a waste of time, H8 battery won’t fit physically, the tray is too short.

What model car? I was planning to do the same in my XC90. I was under the impression that the H8 does fit the same tray. Where is the option to change the battery size? I don't have OrBit yet but I do have the VIDA cable.