as the old post from winfred from 2004 is almost dead (no pics, but the comments are still good by George and others)
http://www.bimmernut.com/forum/showthread.php?t=780

here is a saved copy
http://www.disgruntledgoat.com/conte...ar/ZF4HP22.php

webarchive
http://web.archive.org/web/*/http://...#converterseal