Timing Chain Tensioner Cap Silver Billet Alloy (includes O-Ring) SR500 TT500 XT500,1 Piece, OEM reference:# 583-12212-00 # 583-12212-00-00 Replacement O-rings item K22357 CNC-milled aluminum cap as replacement for the less sturdy original plastic design Made from Duralium, thus almost indestructible! Very nice and discreet appearance Delivery includes new O-ring (Replacement O-ring see item # K22357) Application: SR500 TT500 XT500 Timing Chain Tensioner