News to me- - -but I always use original equipment parts whenever possible. The original bushing is flanged on only one side, and press-fits into the control arm. The rubber bushings are supposed to be bonded to both steel sleeves, and the suspension movement is absorbed by the rubber part flexing. I can't imagine why the polyurethane bushings would be used, if the control arm just rotates over it. I've changed hundreds of suspension bushings, and never left half a bushing in the control arm!
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!