This is the front control arm bushing on a 1994 Camry with high miles. The car is on a jack stand so the tire is hanging down and it makes the cracks more noticeable. When the tires are on the ground you don't see them. There is no unusual tire wear or noise coming from this area and the ball joints and tie rod ends are still tight. Do these bushings need to be replaced based on the cracks or do you generally just wait until one starts getting some clunking noise, movement (or some other symptoms ?) before spending $$ on this for these 20+ year old cars?