I got my springs from Stengel Brothers, no complaints. Google for their website. They have a couple versions, I went with the stock replacements and then added a leaf from a Cherokee for a lift. I already had the extra leaf, otherwise I would have tried a heavy duty version from them.
They came with front bushings installed, that was nice. Rear bushings are easily available, as they are shared with Jeeps. Be careful unbolting your rear shackle bolts, mine snapped and these are NOT available.
I got my Ubolts from a Jeep place again, they are same as a Cherokee I think.