local motor factors mate, i use ajay autoparts (part of the jayar components group) and they have all the s15 parts listed in the blueprint/nipparts catalogue (fuel and oil filers, gates belts etc)
any decent motor factor should stock them as they are all the same parts as the uk supplied 200sx s14a iirc.......if you are changing the fuel filter you may as well stick a z32 300zx turbo fuel filter in, i can't see the benefit apart from it being bigger but it was almost exactly the same price so i just bought it anyway
