The stock bushings that come on your car are rubber. Rubber wears fast and corrodes with water exposure. Thats why you have to replace them once in a while. Polygraphite is a combination of polyurethane and graphite. Polygraphite bushings wont wear as fast and they make your handling stiffer. Graphite is also self-lubricating so there is no need to grease them.
Bushings are located on any suspension part that meets another, like ball joints and links, they are all in places that bend or flex.
PST (performance suspension technology) makes kits ony up to the 97' integra but their website has lots of pics to understand how everything works