Found this today. Looks like the guy has 3 sets. Thought this would help anyone looking for dunstall clip-ons.
Kev
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=280738589983&viewitem=&sspagename=ADME%3AB%3ASS%3AUS%3A1123
Kev
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=280738589983&viewitem=&sspagename=ADME%3AB%3ASS%3AUS%3A1123