Hi Andy, i also have the same from Kitspares.
I also welded a bracket on the rear upright, and used a short piece of copper pipe.
I dont have a picture of it, but check out the album of David Murray.
You will find a picture in his gallery 3, i also used his picture as an example.
http://www.haynes.co.uk/forums/member.php?u=1140
Regards,
Wim