My buddy was parting out his 4.8iS which was totaled, I bought the axle back off him. You'd have to find one used, he gave me a sweet deal though I will say. Only mods needed were the flanges from the 3.0 exhaust have to be swapped on the 4.8 axle back sections as they are different, but that should be easy for any muffler shop to do. Hangers, etc are all the same.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards