Hi Pikey, and thanks for your input. I went straight onto Lings' ebay and 'bought' one! -then I rang Lings about another item for sale and spoke with Mark who, in conversation, told me they actually didn't have any such seats (Part A9708162), -and NEITHER DO TRIUMPH ! -don't know what game they are on but I don't think I like it.
Many thanks for all posts. I will be visiting the U.S. in April, and GPM has sold me his seat and back rest to bring back with me. I wonder if the airline seat belt will stretch------?