Answer: The total seat with is 20", and depth is 17" there are two option there .
1.Dimensions with 5" Rear Casters=
Overall Width 24"
Overall Length 37"
2.Dimensions With 24" Rear Wheels
Overall Width 28"
Rear inernal widh is the size between the rear big tires.(second option chair:-https://cdns.webareacontrol.com/prodimages/1000-X-1000/1/t/15420175826Non-Tilt-Aluminum-Shower-Commode-Chair-With-20-Inch-Seat-L.png
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