What 4 link should i buy and where to buy it?

[abadsvt]

I am looking to buy a 4 link setup cause i am going to bag my truck. What setup should i buy and where to buy it. I know there is so many different setups and i don't know that much about them to decide which is better. Also what else do i need. I am going to buy a c-notch setup. Which one should i get or all they all really similiar? I know i am going to have to buy shock relocaters. Am i going to have to buy a different crossmember ( this that is what the 4 link bolts on to) since i plan on lowering the truck alot? I would like to have everything ordered by end of next week. Thanks Josh