I am hoping to replace the rubber bushes on my 66 230SL,is this a job for the DIY.I think they are all the originals but there is no knocks or squeaks from the car but I suppose after 44yrs they need replacing.The engine mounts where done not so long ago, also I think the shocks may be original, whats the best way to tell if they are not performing correctly again there are no knocks or creeks,the car has done a documented 54k.Has anyone ever tried the polybush or nylon type bushes.Any info appreciated.Thanks Mike