As Forg says ^^^^, the Chevy SS does indeed use the same 4 pot Brembo's as on the SSV Redline, and 2016+ have front and rear (pre 2016 only had the front brembos)
For an easy upgrade, especially living in the States, is to just buy a set of V2 CTS-V front calipers 6 pot Brembo calipers and...