Lots of options. Most will say go with marlin stuff. All pro and trail gear also make kits. Sky off-road I believe sells most of the required parts as well
I just did an sas on my rig and used almost all trail gear stuff because they were the only ones that make right hand drive hi steer. If your in canada, trail gear canada has awesome customer service. Plan to spend at least 1500$ or more depending on what all you upgrade and how much you find an axle for. My final build was much higher than that but everything is overbuilt and brand new.
Budget a fair amount of time for removing old brackets unless u have a torch.