I couldn't bear not knowing the answer to this so I made a phone call to Monroe and talked to Jeff in tech support. Nice fellow, but he said Monroe considers spring specs to be proprietary, so he could not share that information. BUT, he did tell me that Monroe recommends against using the Quickstrut on the SHO and Police Sedan because the spring rate is too soft! That exception does not appear in their online catalog so far as I can see.
So I guess we have an answer after all. Monroe (or at east this tech support guy at Monroe) says the Quickstrut spring is too soft for the SHO and the Police sedan. He said the Sensatrak + Moog cargo coils is the way to go.