Nope mine didn't come with it,
You want me to mail you a template for the base or top? If you are looking to keep the seat in permanently I would disregard the folding leg and go with a permanent base similar to tx skiers.
If it were me I would make the base permanent and use the slide in top like the factory 209. That way if you had a full boat you could leave the base in and remove the top section easily to allow access to the bow without having to remove the base.