The Brembo big brake kit for the 2008–2009 Mercedes-Benz CLK63 AMG Black Series is a rear GTR package pairing a four-piston billet caliper with a 345x28mm two-piece drilled rotor in nickel. Listed as a rear BBK, the kit specifies drilled rotor faces and nickel plating combined with billet calipers for the Black Series fitment noted in the source description.
Brembo 08-09 CLK63 AMG Black Series Rear GTR BBK 4 Piston Billet 345x28 2pc Rotor Drilled- Nickel