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. Aprilia SR 50 LC (2018 Onwards) 7.5g Variator Rollers 19x15.5mm.