Product review (5 stars): Watch your fingers
Five stars because it works fine, but installation was harder than expected.  This part works fine in a KitchenAid KUDP01DLBS3, although the holes in the top surface look different. It was a little more work to install than some of the videos led me to believe, mainly because I didn't have any pictures of the three removable plastic tabs that fit into slots just below the main gasket (I wish now that I had taken a picture for this review). They are spaced approximately equal distances around the circumference, and  wedging them into place helped to seat the motor in the tub cutout. The KA part number for these tabs is PS3489380 if you want to see what they look like, but the exploded parts diagram does not show how they fit. Once you get under there, you will figure it out.  I found it necessary to pull the dishwasher out for better access to everything.  And be careful around the cutout in the stainless steel tub, because the edges are sharp and will cut your fingers easily, just ask me how I know. Also, this particular KA model has an extra connector that fits between the drain hose and the grey outlet, with two wires running to it.  I'm not sure if this is a turbidity sensor or some other sensor, but you will need a small Torx screwriver to remove the bolt attaching it to the pump housing.  Lube all the gaskets with dish soap as everyone says. I was very happy that it all went back together the first time with no leaks, and now it's humming along just like new.