rs frampton

hi people i posted a thread about were to take my poorly rs focus a few days ago and got good feed back thanks, ive had her looked at and the error message on bthe ecu is solinoide wastegate and cant be cleaered my focus stalls and cuts out omn idle everytime and doesnt go on boost properly gets really hot and kicks white and black smoke although i have a straight through pipe so my question is does anyone know were i can get a good solinoide wastegate replacement for my car and can you buy it seperate? cheers