KiWAV rear master cylinder brake 3/4" bore chrome billet for Harley-Davidson oem#42454-80A, 42453-80A, 41754-79A Complete 3/4 bore rear Kelsey-style master cylinder assemblies Bolt on Installation OEM replacement (42454-80A, 42453-80A, 41754-79A) Cylinder Bore: 3/4", Banjo bolt 3/8" x 24 100% made in Taiwan, nice and stable quality