bushings?????

how can i tell what size swaybar bushing i need i have a 99 xj sport 4x4 i see the kits start off at 24 mm and got up to about 30 mm

please help

Measure the sway bar with some calipers?

My sway bar was super rusted so I measured near the mounts and got the wrong measurement and the wrong sized kit. When I took off my mounts, the sway bar was smaller there. Just a tip if your sway bar is rusted. On another note, if your sway bar is 1-1/8", I have a new Energy Suspension greaseable kit for cheap if you want it.