I have used Performance Suspension Technology Co. for a rebuild kit on another Chrysler I have. As I recall, polyurethane bushings were not available for the C-body that I have, with the exception of the upper control arm bushings. A poly bushing car will ride really hard. Poly bushings in the upper control arm, though, wouldn't be perceptable as that suspension component just sits there guiding the upper part of the steering knuckle, and would provide a bit more direct control of the knuckle's geometry. PST's website is at http://www.p-s-t.com/ Eric '63 Crown 4dr '72 Newport Custom sedan ******************************************* However, it's also my experience that they ride a lot rougher because they are stiffer than the original rubber parts. This is just fine for Jeeping, and I'm sure for Mustangs & Camaros, but I don't think I want the ride on my IMPERIAL modified in that direction. I think I would prefer to seek out the rubber parts, over polyurethane ("PU" as Dietmar put it, for typing speed. (:-D))