Motorcycle Engine Seal VZ800 2005-2023 OEM 11142-41F00 Works for Fit For Boulevard C50 VL800 2006-2023 VZ800 M50 05-19 rear cylinder head with OEM part number 11142-41F00 Aligns bolt holes cooling channels ,no drilling or extra auxiliary fittings needed Forms tight sealing barrier to coolant leakage under long time engine operation Multi layer composite sheet, die cut contour,flat uniform contact surface finish Calibrated standard thickness full outline size to match rear cylinder head frames