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Sprocket Lock Plate G044-005, Front, to suit a 20mm sprocket shaft diameter.
Please check the hole spacing on your sprocket to assure this wil fit your existing sprocket. The output sprocket shaft diameter is 20mm across the outside of the spline diameter. 
 
Thanks from Supercheap Motorcycle Parts (Australia). Australian owned, with 100% replacement warranty and good old fashioned  service and advice if you ever need it, please spread the word.