These tanks have served me well over the years and got me through many "dry" sections. Made of lightweight aluminum they hold about 1 US gal. each. They have the anti-slosh foil in them and I'm including all the old lines and fittings for you to pattern on if you want to make new ones. These are non-vented when the main tank petcocks are closed, so you need to remember to crack a cap when parked especially if it's warm or the bike is sitting in the sun. With these it's like having four reserve tanks … good for another 100 miles! There's an extensive (exhaustive!) write up on the Snowbum site. Will ship at buyer's expense. Located on Vancouver Island, BC.