1. Note that Gs and ESi is also listed. I didn't feel the need to break the list down to just Base/Rs & Gs/ESi because they all share the same size front sway bar.
2. The reason 13mm didn't sound right is because I have never seen an after market bushing available from Prothane or Energy Suspension for the Eclipse/Talon in that size. The whole reason I started researching sizes is so I can replace my bushings. I was trying to figure out why 3 different sizes were offered and which size I needed.
3. CAPS was my reference. I don't use the CAPS on 2gnt. It is incomplete and doesn't link you to all part numbers.
Here's the 3 part numbers for the front sway bar. MB910391 16mm MB864694 18mm MB871885 19mm
Here's the 3 part numbers for the rear sway bar. MB948100 12mm MR130722 15mm MB914340 18mm
Six different bars do exist. The convertible might or might not have a play in the different sizes.