http://www.windingroads.co.uk/shop/product.php/150/tank-bag-tank-panniers-bmw-f800gs You may need to add a crash bar to allow spacing for cooling. BMW F800GS E Max Tank Set - Tank Bag and Tank Pannier Set Using the Enduro Max (FA244) Tank Bag with a custom fit base allowing the fitting of two forward pannier bags adding an additional 9 litres (approx.) carrying capacity per side. Made from 1200 / 1200 tear resistant, shower proof woven polyester with semi rigid inserts to aid loading and shape retention, the tank bag features 3 external pockets as well as top map pocket and is expandable from 13 to 19 litres. The bag also has carrying straps and grab handle for ease of use off the bike and waterproof cover. Featuring easy to use YKK zippers and 3M Scotchlite reflective piping for visibility and safety. The strap on base uses FAMSA’s unique Soft Fix system. Dimensions (cm) 35 x 26 x 20 / 29 (Tank Bag only). Not guaranteed to fit with all makes of crash bars.