D15b2, d15b7, d16a6, d16y7 will all work with very little extra work. B2 and b7 will be direct drop in, a6 and y7 will need things like header pipe and intake manifold support bracket modification. there may be other options as well depending on what country you are in, pretty much any non vtec d series engine can be made to work, depending on how far you are willing to go.