I have a set of power/heated buckets from an 03 Durango that I'm putting in my 04 Dakota. At the widest part of the bottom seat cushion they measure just a tad over 20" and right at 38" high, but they are sitting on the floor in one of my spare bedrooms. If memory serves me right the 40 has a flat floor so the seat tracks would have to be changed or tweaked.