Product review (5 stars): Worked fine - here is an install tip
Turns out the extra  "body" part of the pump, which I ordered as well, because I thought I might need, is simply the plastic shell and this part here is in fact the entire moving "pump" so don't bother ordering the body unless yours is ruptured.  Note somebody mentioned that install may be available from the bottom of the machine.  My experience was that it was impossible because of the position of the screws holding pump on, so I had to remove the front.  Although I purchase a tool to replace the door gasket ring, it ended up being pretty easy to do with a couple of (dull) putty knifes.  The key is to make sure the gasket is completely fitted into the metal lip first, then stretch the ring around like fitting a bike tire- pretty easy.  Hardest thing actually was keeping track of which screws went where and which wire to hook up where on the pump - next time I'll take more photos.