They should come with both halves but not with new bolts. You can reuse your old ones as long as you don't break any. They don't require modification, hopefully your car has had the subframe recall done. I'm not sure if it won't work without that being done but i think the captured nut that the bolt tightens into might be different. Get a friend to help you and check out the phenix sho web site for the how-to. Do not use an air ratchet if you can help it, you can easily screw up the "nut" which is more like a plate on the inside of the frame rail, and under the carpet. I ended up spinning one of mine free and had to cut part of the ac system out to get my hand into the access hole. Luckily the ac didn't work and i had no plans on fixing it. Make sure you clean all the rust and stuff off the surfaces that the bushings are gonna touch and buy yourself some front sway bar bushings as you'll be able to change them while the subframe is dropped. Lastly mine were 15 each but its gonna depend on each dealer and when i checked places like rockauto they either didn't have them or they were the wrong ones. Don't hesitate to ask any more questions