Naraku HD FKM Crank Bearing & Seal Kit for Piaggio AC / LC 2T 50cc. Heavy Duty (HD) crankshaft bearing set from Naraku, supplied with Japanese NTN bearings and FKM premium crankshaft seal rings. This product is suitable for the Derbi Sonar 50 2T AC 09- (Piaggio engine) [VTHLR1A1A].