umm... Last i checked mazda rear wipers were dealer only!
Something you might want to try, is removing the wiper altogether. This was originally done Txsandman, looked very clean and I had to have. Thanks Clark.
http://i45.tinypic.com/2w4dw81.jpg
http://i50.tinypic.com/14v5ks9.jpg
http://i47.tinypic.com/105ql37.jpg
Sorry for only links, stealing from another post