These bushings include new zinc coated brackets with mounting holes that line up with the front sway bar mount on the MK2 MR2 and the rear mount holes on the MK1 MR2. Additionally, these bushings can be used for the rear sway bar on the MK2 MR2 if you place them in the OEM brackets.
The easiest way to determine what size you need is to place open end wrenches on your sway bar until you find the one that is the closest fit without being loose.
If you need front bushings for a MK2 MR2, you should order them with the Delrin spacers here.