The Bolt,flg.soc.6x35 is the most widely applied product in the XL600R 1987 (H) USA LEFT CRANKCASE COVER / ALTERNATOR ( six times ).
The component with the lowest price in the LEFT CRANKCASE COVER / ALTERNATOR schematic is the Bolt,socket,6x25.
Check out any of the twenty-nine Left Crankcase Cover / Alternator components enlisted.