I've done a little research.
20x9 ET34 Brembo's will fit (SRT Replica)
20x8 ET56 Altitude OEM wheels
Difference 34.7mm more clearance with the SRT replica meaning
it sits about 1.366 inches further away from the caliper than the OEM wheel.
In theory a spacer that size should allow for the Brembo SRT brakes to fit.
...of course im not taking into consideration the spoke design of each wheel but this is a start.