Taco 4link

I Have my taco baggged in the rear with an 8' notch, bridge/w bags over axle. I have a mono leaf for the time being but i wanna get a 4 link setup, is there any pre built 4links for the tacos and if not can people who have done it give me some ideas. where did you get yours, where should i mount the bars & how long of bars do you have, just whats the best way to go about figuring out what i need & the best way to do it.