ESPO and springsnthings get good reviews on here regularly. An option would be to have your shop rearch the main leaf(s). You can clamp the springs out aways from the center bolt with a pair of C clamps then remove the nut on the bolt to seperate the leaves. I like to crack the nut with a nut cracker as the threads on the bolt tend to get messed up from road debris & I dont want to break the special bolt but your shop would have em on hand.