I put an H7 in mine, and did not remove the whole block, just removed the one positive cable on top that allowed me to move the block up a little higher to slide battery under it. I would not be afraid of the batteries that they are discontinuing, still get same warranty as one that is new. Are they a pro rata battery like the Everstart Maxx at Walmart? If so, they will have a 3 year free replacement and 2 year pro rata warranty. So essentially a 5 year warranty. That is a good buy on that battery. I paid around $170 or so out the door for mine. Never seen an H8, I don't think an H8 will work in a Cruze. Only three sizes that I know work are H5, 6, and 7.