@fazimoto
your rotors will fit for sure, i did something similar once and i later found out that the suspension is the same for all our models (US/UK/JP & Pk). Just make sure your rims are big enough to clear the new disc/caliper setup (make sure your offset/ET is right).
you can get headers here as well for your SOHC D15 so if you are not too sure you shouldn't take the risk. surprisingly the ones here also have the 4-2-1 setup (unlike the old ones which were 4-1. you can use a new factory gasket since they are pretty good as well.
Pretty muvch anythign is available but it's just a matter of looking for it (and not getting ripped off)
Good luck