Merry Christmas Clive so the foot plate box (F) is 19" the tray is 10' 8" long minus tool box (d) lid (g) ? The parts we have would be a MK X so I think I need a plans or Details of a MKX . The front reinforcements top right of the photo to me indicate a later MKX where do I look we have no seat or mounts ,list of changes,carpenters manual ? .Regards Mal ps the chain hanging down in the Briggs photo is that not the scotch roller chain .