Sway bar diameter seemed to vary greatly between models as discussed in the polyurethane sway bar bushing thread but all should fit all as long as you have the correct diameter bushings for whatever sway bar you're trying to install. Now will there be a noticeable difference between the smallest and the largest diameter sway bar? Probably not much. Difference between no sway bar and any sway bar? Yes. So if you're trying to change the ride by sway bar then unless it's free you're probably wasting your time but if you don't have them and you want some antisway it's worth it.