Price
Replacement for the lower shock shaft bushing - these are part of what holds the shock shaft into the shock mount, which connects to top of the shock to the chassis. These can degrade over time, so it's not a terrible idea to change them when you're doing a suspension change. This is a set of four, enough for one car.
The Mazda equivalent part number is NC10-28-776. Also available as part of a kit.
There is no equivalent bushing on the 1990-97 models.