Rotating brush

Go to sears.com, click on the parts link, put in your model number(look on the metal tag to get the correct number),then select the one that is yours, a parts list with a link for a picture breakdown will come up. From the parts list, you can select the part, then you can pay for after clicking on the shopping basket.

The model number will look something like this:
116.*********

You can either call their parts line, (800) 252-1698, or on the sears.com you can email them thru their contact link, give them the model number that you have and what you are looking for and see what they have to say. The number you are seeing is a sales number so if you don't see a different number, then you will hve to contact them direct. The other possible thing is to take out the brush roll and find a local repair shop that has various brands of parts, maybe they can match one up for you.