bottom clamp for tightening. I installed a few washers as spacers so it sits up a little higher after being bolted down. Gives a little more room to access the clamp (since you'll need to check again after a few days since a new hose compresses). Just relieve fuel pressure and plan to cut the old hoses for easier removal. Use some petro jelly on the hose barbs to make new hose installation easier.
Can't comment about the autozone part, I used Nissan OEM last time I replaced.