These shocks added height to my Duster's stock suspension

General spring looks to have the best price. 109 for the HD springs and 99 for the standard

Call and make SURE those ate the XHD springs, the "340 springs". That should do it. If I were you, I would make a thread asking to see the XHD springs on Darts to see if that's what you want. I am sure plenty of these guys have them.

Before you spend anything though, I would double and triple check the car to make sure nothing's wrong. Measure the front segment and inspect everything real close. Last thing you wanna do is spend unnecessary money.