Amazon.com: 43mm OD / 30mm ID Special 4-pin Spanner Socket Tool for Slotted Castle Locking Nut Remover Equivalent to 30mm End of Honda OEM Tool 07716-0020203 (30mm End Only!) For Clutch Center
Amazon.com: 1PZ Type 20mm 24mm Castle Nut Engine Motor Mount Lock Nut 4 pin Spanner Socket Tool Replacement for Honda CBR1000RR CBR600F4 CBR600RR CBR900RR GL1800 RVT1000R RC51 VTR1000F Superhawk (CT2) : Automotive