I am afraid such conversion will not be possible. The IC 4 XLR-connector configuration is mechanically incompatible with the large 7-pin DIN (Tuchel/Binder) connector used for the U 67. The original swivel adapter cables (UC 9 or UC 10) have long been obsolete and are nearly impossible to find. Your best bet may be the traditional spider type shockmount, like the Neumann EA 170.