They will work, but you're better off getting some of the ones that stick out longer (like the kind for the threaded on lug caps). The factory RMW lugs will probably be recessed into the bolt holes on the SS wheels. Sometimes it's hard to get a lug wrench or gun in there. A Town Fair Tire stripped a lug nut on my car once, and then the lug almost wouldn't come out because you couldn't get to it inside the recess. Finally came out with an easy out type of thing.
This is based on what my '93 Caprice and my brother's RMS is like, I'm not sure what the Impala SS used from the factory though as I haven't had one yet. LOL