The twenty-four Xt660x 2007 11b1 Denmark 1f11b-300f1 Crankshaft & Piston component parts are all listed in this schematic.
The Circlip is the cheapest item from this partsfiche.
A sample from the products for the Crankshaft & Piston include: Pin, Crank 1, Crankshaft Assy, Crank Sub Assy 1, Ring, Piston.