Cab Dimensions: 45.8" H X 20" D X 19" W
Measured Width Just under 19 Inches.
Depth Just under 20 Inches.
Width MUST be at 19 Inches but depth can be under 20 Inches.
Riser 20.50 x 19.75 x 13.25 Inches Raises height by 1 foot.
Width 19-20 Inches. No More No Less
Depth can be 16-20 Inches. More is OK but Not desirable.
Height 16+ Inches.