I think you're talking about the stabilizer-bar end links rather than the bushings, correct? The end links (on a front-wheel-drive car) have a ball & socket assembly at each end of a steel rod. They connect the end of the stabilizer (or anti-sway) bar to the front suspension. Cheap aftermarket ones often have grease fittings. The better ones don't.
The stabilizer bar bushings are completely different beasts - they are rubber or synthetic rubber, and provide some NHV isolation where the stabilizer bar attaches to the body (not the suspension) of the car.