Hey Camron
Here is how I do it. There are a couple things you can try as far as getting it out. I have used a torch a couple of times and that did the trick quick and easy. Other times I have gone to the store and pick up a can of sea foam bolt remover or PB blaster. If all that doesn't work thats when I pull out the sawzall
A good metal blade and some wd-40. Normally just cut right between the spring and the mount. If your clean and good with the saw you won't mess up the bushing. If you lift kit came with new bushings then dont worry about it and go to town on it
As far as where you get the bolts to replace them with I use grade 8 bolts you get at Lowes or Home Depot. There nice cause there zinc plated and dont rust. Go Idea to just change all the stock bolts while your at it. Its so nice to have leaf sprung rigs in this club.