20.5165.74 (20516574)
This is a LEFT SIDE Brembo 30/34 Goldline caliper with red logo, Brembo's most current 40mm mount, 4 piston, 2-pad offering. Comes with standard Brembo brake pads installed but you can choose to upgrade to Galfer 1054 compound or others in the choices above.
Remember to always use a good DOT4 brake fluid such as Motul RBF600 which I highly recommend.