Many thanks Picasso and Starider for your responses. I found the springs on eBay. Million dollar question, do you know what extra payload these springs give you? I managed to find the net and gross vehicle weights (my terminology) for my vehicle. I have also weighed my vehicle post conversion, the end result being I don’t have much payload, so need to do something! I note there is a discussion about vehicle weights/payload on this forum, and problems people have had trying to find vehicle weights. Just in case you are interested I managed to find a web site which had all the original Alphard brochures which you can download, and the two I looked at contained the net and gross vehicle weights, the link is autocataloguearchive.com. I will also post this link in the discussion thread about weights.