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Welcome to the forum, $500 for the fuse 27 relocation kit is highway robbery! Watch some of the YouTube video's on how to do it and you can get the kit on Amazon for about $20.00. Check your shock bodies for leaking and how is the ride? If no leaks and rides OK, you can wait on the shocks. I would investigate the AC vibration before starting any other repairs until you know what that is and cost to fix.