You can take your chances importing them, they are a hit and miss. Sometimes they get through, sometimes they don't. The reason why you can get them in country is because retailers have permits that allow them to bring in stuff like that. To your first question, CW and CCW refers to the threads, AKA CW you turn right to tighten, CCW to the left.
I'm not 100% sure if this is correct, but this is what I have been told. Can anyone verify the threading question?