Product review (5 stars): Perfect fit
Exactly as described.  Fit perfectly.  I have used pans under all my water connected appliances and placed water sensors in them to notify me on my smart phone if there is any water that gets in the pan(s).  Since this one is open in the front, just run a tight bead of caulking along the front of pan after DW install to make it hold some water to be sure it gets to the sensor before it overflows into the floor.