I also have 8 of the x-factor RK arms... but bought them 6 of them used from a person wanting to go long arm. So I also bought used Currie 4 inch dual rate coils.... Ordered new ends on the RK arms and went to make a "franken lift" of sorts... it has parts from several vendors to find what would work right. I don't recommend doing it this way... lol. But I got a lot of quality parts very inexpensive as I put it together.
I got MT Goat spring wedges for the rear, jks lower rear spring keepers and teraflex top spring retainers, teraflex bump stops. rancho 4 inch lift links for the sway bar. JKS rear track bar... had to cut or trim here and there.
After the rear was all installed, I had to trim the pinch seams... splice the eghaust and have a newly bent section made to keep it from rubbing on drivers side- at full flex, and I had a small rub spot on a spring with the rear track bar nut... I rounded off one corner of the nut with a grinder to clear and it is good now. But it was a little bit of a pain getting the things measured right to work without hitting something. The new kit might be "plug and play"... but mine was not, but I assumed it was because the mixed part process I went through to build my kit part by part off of the forums and e-bay.
For the front I only had the complete lower arms, and just the front half of the RK arms... so I bought the metal cloak upper joints. A Metal Cloak front track bar, extended front track bar inks.
I did end up real close to the recommended length for each arm, and there is great articulation with the RK arms. I have been running this for about 3.5 years.
I thought I had to do so many little adjustments because it was not all a RK kit. But it sounds like it would be the same even with all their stuff.