HOW?? TO CONVERT FROM METALIC BUSHINGS TO \"RUBBER\" ON 66 4x4 SUBURBAN Can someone please tell me how I can switch to rubber/poly/urethane type front leaf bushings on a 66 Chevy Suburban stock 4X4 and get away from bronze/brass type. What is the first year of rubberized and what part do I need. Can I de-rivet a shackle from some year and bolt it on? And use new type springs? What year do I need? Why doesnt some company make a "rubber" replacement?