I've been thinking it might be a good idea to do a refresh on this, the job seems simple enough. However when I go to Rockauto I get quite a list of different sizes and I don't know which ones are the correct size. What did the factory have?

 

Once again, RockAuto (or any other parts source) is not a reliable listing of parts fitment. Measure the diameter of your sway bar and buy bushings based on that. If you don't have a caliper, use an adjustable wrench to gauge the diameter of the bar and measure across the jaws of the wrench to get the size.