I don't recall having any issues fitting the Bilsteins on my Dart, Duster or Challenger. It looks like they're using poly bushings now, which will need poly grease if you want to install them correctly.
I hadn't even considered that they might be poly. It was fairly easy to press the bushings in and out of the shock eyes and I just assumed they were rubber so I didn't apply lube of any type. Is there an easy way to tell if rubber or poly?