Hi Dave, cheers for the pic it helps a lot, the seat i have looks something like that but isn't quite right, it has the original back, base and folding front bit so maybe a vehicle upholsterer can make something that looks more like the one in the picture. As an alternative i found an old note in "The Star" from May 1980 saying a Triumph Herald seat fits straight in, they will be pretty rare these days but there is one on ebay so that's a thought, thanks again.