Part number:
2L1-W1413-00-00-V PLUG SCREW SET, W FKM O-RING. Identical to 2L1-W1413-00-00 (i.e. genuine Mikuni components) except with FKM (aka Viton) o-ring. Recommended tightening torque: 18 in-lbs. (2.0 Nm). NBR vs. FKM o-rings
$18.40