While sorting all the leaf spring and shackle bush business, many replace those panhard rod bushes at the same time.  Chances are they are original and older than you!  At K&D we feel the panhard rod bushes should allow some flex so you aren't hammering your rod.  We don't and won't carry the poly stuff 'cause none of you drive your Interceptor like a maniac anyway! 4 bushes per car.