S4/S5 interiors are not all that interchangable.
the dash, armrest, side carpet that goes around the rear shocktowers, and bins are the same. probably a couple other random pieces too. just about all of the plastics dont fit, thanx to the seat belt change.
the carpet does fit, but has a lot of holes in wrong places, so there is a lot of exposed chassis.
basically, andyhting that is near any part of the seat belt system is different.
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