Sony Ericsson W600i / W550i

i used to have the t637, and there was this little adapter that would clip on the end of it, it would allow me to use my own noise canceling ear bud. But i now have the w600i, and i am asking if anybody knows where i can buy the same thing for my w600i. the ear bud that is made for the phone picks up too much back ground noise. i know that the phone comes with the long cord with the mic on it, but that defeats the purpose. i am starting to go crazy with this. thanks for any help anyone can lend.