It sometimes seems Kawasaki uses the softest bolts available to retain the Concours fuel tank. Murphs' is willing to bet at least one bike at any technical session/get together will have a bolt broken off in one of these two holes. Before this happens to you, replace them with a set of stainless steel socket caps with hairpin releases! Having them also makes removing the tank just a tad quicker and easier.
Replacement is as simple as can be; screw the bolts in and forget them! To remove the tank,
simply remove the hairpins and flat washers. The tank slips easily over the socket caps!
Check out the quick installation diagram here.