Wondering if this would fit a 'later' model W116 column (large thread).
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&rd=1&item=170196085009&ssPageName=STRK:MEWA:IT&ih=007
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&rd=1&item=170196085009&ssPageName=STRK:MEWA:IT&ih=007