four link stock rails?

i want to go with a four link rear suspention in my 69 dart. Building 512 ci stroker. I know rms makes one is there any one else that has a kit for stock rails . I talked to s&w here in Pa but all theres are for there rails is this common any one know of any? i like rms but dont know if its set up for mid 10 passes thanx matt:dontknow::dontknow: