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Pretty much every aftermarket suspension company does , Race Tech , Pro Circuit , Ebach , Progressive Suspension , ALL should have a spring set to fit your size , it is a very common size to be over 200 , and the springs are the same 250 or 450 , so they should be plentiful , you should be somewhere around a 0.47 (stock for a 450) and 6.2 for the rear , or a rate higher on each if you are closer to 250 , which should be available anywhere , the rates I mentioned is for someone around 235/240 give or take since that is kind of in the middle of your listed weights