670B2018 x2 – 18.0mm x 2.0mm – used to seal the 2 oil galleries where the oil pipe fitting with the oil pressure switch mates to the crankcases.
92055-055 x1 – 20.0mm x 1.5mm – used under the oil pressure switch
670B2015 x2 – 15.0mm x 2.4mm – used under the oil gallery plugs. One of these is used on the oil pipe fitting, the other on the right side of the crankcases directly behind the cylinder block.