Thanks Mine is listed from Andover as 1973,850cc Roadster , however it has an interstate tank. I have read here that there were two sizes of that tank? Mine must be the largest one as it is a wopper . The seat fits vell against the tank , it has a slight rise at rear and the top is squares withought a strap .It also has plastic fabrick holder around the bottom with two chrome stripes.So in a previous incarnation it changed. Well its present life is another reincation. I promise to post pics the easy way as soon as find a young mind to teach me. Ps It has taken 30 mins to peck this out on a tablet so it could take a while, Cheers all Ian