I sent the one from the challenger I'm working on to I think steer and gear. They can make them stock or change to a more firm feel. I haven't driven the car yet, so can't say how much firmer they feel. Price is 275 and thats stock or firmed up, plus the core, I just sent mine in at the same time. But check the link.

http://www.steerandgear.com/remanufacturing.shtml