The 8k axle may be different but on the 7k axle 9/16" studs, Redwood has 5 studs coming thru the axle bracket which should attach to the disc brake bracket. On Kodiak's 7k axle bracket you must use a spacer placed between the axle bracket and the disc brake bracket. The problem is the stud is not long enough to accommodate the spacer without removing the studs and replacing with grade 5 bolt & nut. The Kodiak bracket works fine on 1/2" stud 7k axle. Appears Redwood has both 9/16" & 1/2".
Ron & Margaret
2014 Ram 3500 DRW 6.7, Aisin, 4.10
"Pequod" 2015 Redwood 38GK