Anyone running CPP or e-brake caliper style rear disc brakes? I need a measurement

[BritishGreen68]

Im looking at buying the cpp rear big brake kit or something similar. My car is on airbags and when its down I have about 3.25 inches between the axle housing outer flange and the frame rail/inner wheel tub on my Camaro, so the emergency brake bracket/linkage or inside part of the caliper might hit . I am looking for a measurement from the caliper bracket mounting surface on the caliper to the inner most part of caliper, or axle housing flange surface where the caliper bracket bolts on to the inner most part of caliper. If someone could take the time to measure that it would be much appreciated!