I was told some company bought out Oster and/or they discontinued the Kitchen Center. It was a blender and mixer in one. My mom's is a dark yellow, with stainless steel bowls that sit on a turntable. You can take the top part off to put the blender on it. It came with dough hooks and some other one. Here is a picture of it, from the cookbook they had with it:

http://cgi.ebay.com/1980-Oster-Kitchen-Center-Appliance-Cookbook_W0QQitemZ230113206915QQihZ013QQcategoryZ982QQcmdZViewItem?refid=store

Even if it's not Oster, I've been trying to find something similar. Any help you can offer is greatly appreciated! Thanks!