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I would suggest you measure to be sure but you probably have HD springs.Both have their advantages and drawbacks. Quality rubber bushings will behave like the factory system and I believe that is what you are after? BTW, they are not easy to change, so be prepared if you are doing them yourself.
They are pressed in and don't just pop out. Same with the shackles. For the shackles, you may just want to get new ones.