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.