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99 civic ex's are sohc vtec, d16y8.
if you got a non-vtec model, you got screwed.
ANY b-series you put in your car will require the mounts from the 99-00 civic si, em1 chassis. the rear mount and drivers side mount specifically. the passenger side mount, the teg mount will work as well.
more over, putting that motor in you car is illegal in at least 35 states, as its older than the chassis. consult your local laws.
IMO, if you're looking for a b16, find a crashed 99-00 civic si, and buy the whole swap out of that. it will be the easiest, and has all the parts you need.