Bought the whole pump and motor which eliminated the old "chopper" assembly which was causing so many problems. They do not make or offer the chopper assembly anymore. Significant noise coming from the old unit which was so loud you almost had to yell to be heard in the kitchen.
Replaced old unit with pump and motor assembly using the video to install and it was a breeze. Now the unit is quiet as a mouse just like when we installed the unit in 2005.
Had a couple of extra parts I thought I needed but AppliancePartsPros.com had no problem providing a return for these part. I really like Appliance PartsPros.com as I have fixed and repaired my microwave, stove, fridge and now dishwasher for far less than new would have costs and the videos are a special treat showing exactly how it is done.