Skyjacker springs will work in the Marlin hanger. But that begs the question, why would you use a spring that has damned near NO flex? I have a set of them and they suck. A buddy runs the 5" and the fronts work alright but the rears didnt move. AT ALL! Dont waste your money, build a set of stock rears for the front and use Marlins or broncoII's in the rear.